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<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>1996</year><year>2011</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.
    
      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.
    
    </legalnotice>

    <title>SNMP Release Notes</title>
    <prepared></prepared>
    <responsible></responsible>
    <docno></docno>
    <approved></approved>
    <checked></checked>
    <date></date>
    <rev></rev>
    <file>notes.xml</file>
  </header>

  <section>
    <title>SNMP Development Toolkit 4.19</title>
    <p>Version 4.19 supports code replacement in runtime from/to
      version 4.18.</p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p> 
-->
      <list type="bulleted">
        <item>
          <p>[compiler] Added support for the textual convention 
	  <c>AGENT-CAPABILITIES</c>, exported by the SNMPv2-CONF mib.</p>
          <p>The <c>reference</c> and <c>modules</c> part(s) are
	  stored in the <c>assocList</c> of the mib-entry record 
	  (<c>me</c>). 
	  Only handled <em>if</em> the option <c>agent_capabilities</c>
	  is provided to the compiler. </p>
	  <p>Also added ("full") support for MODULE-COMPLIANCE,
	  which is handled in a similar way. 
	  Only handled <em>if</em> the option <c>module_compliance</c>
	  is provided to the compiler. </p>
	  <p>See <seealso marker="snmpc#compile">compile/2</seealso> 
	  for more info. </p>
	  <p>For backward compatibillity, the MIBs provided with 
	  this appliaction are <em>not</em> compiled with these 
	  options. </p>
          <p>Own Id: OTP-8966</p>
        </item>

        <item>
          <p>[snmpc] Added a MIB compiler escript, 
	  <seealso marker="snmpc">snmpc</seealso>. </p>
          <p>Own Id: OTP-9004</p>
        </item>
      </list>
    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <p>-</p> 
<!--
      <list type="bulleted">
        <item>
          <p>When the function FilterMod:accept_recv/2
	  returned false the SNMP agent stopped collecting 
	  messages from UDP.</p>
          <p>Own Id: OTP-8761</p>
        </item>
      </list>
-->
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.19 -->


  <section><title>SNMP 4.18</title>
    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
    </section>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>Cosmetic prep for R14B (plain) release. </p>
        </item>
      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.18 -->

  <section>
    <title>SNMP Development Toolkit 4.17.1</title>
    <p>Version 4.17.1 supports code replacement in runtime from/to
      version 4.17, 4.16.2, 4.16.1, 4.16, 4.15, 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>When the function FilterMod:accept_recv/2
	  returned false the SNMP agent stopped collecting 
	  messages from UDP.</p>
          <p>Own Id: OTP-8761</p>
        </item>
      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.17.1 -->


  <section>
    <title>SNMP Development Toolkit 4.17</title>
    <p>Version 4.17 supports code replacement in runtime from/to
      version 4.16.2, 4.16.1, 4.16, 4.15, 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Added very basic support for multiple SNMPv3 
            EngineIDs in a single agent. See 
            <seealso marker="snmpa#send_notification">send_notification/7</seealso>, 
            <seealso marker="snmpa_mpd#process_packet">process_packet/7</seealso>, 
            <seealso marker="snmpa_mpd#generate_response_msg">generate_response_msg/6</seealso> or 
            <seealso marker="snmpa_mpd#generate_msg">generate_msg/6</seealso> 
            for more info. </p> 

          <p>Own Id: OTP-8478</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <p>-</p>

      <!-- 
      <list type="bulleted">
        <item>
          <p>The config utility 
            (<seealso marker="snmp#config">snmp:config/0</seealso>)
            generated a default notify.conf 
            with a bad name for the starndard trap entry (was "stadard trap", 
            but should have been "standard trap"). This has been corrected. </p>
          <p>Kenji Rikitake</p>
          <p>Own Id: OTP-8433</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.17 -->


  <section>
    <title>SNMP Development Toolkit 4.16.2</title>
    <p>Version 4.16.2 supports code replacement in runtime from/to
      version 4.16.1, 4.16, 4.15, 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[compiler] The SMI specifies that a table row OID should be 
            named: { &lt;tableIdentifier&gt; "1" }. </p>
	  <p>A new option has been introduced, 
            <seealso marker="snmpc#compiler_opts">relaxed_row_name_assign_check</seealso>, 
            that allows for a more liberal numbering scheme</p>
          <p>Own Id: OTP-8574</p>
        </item>

        <item>
          <p>[agent|manager] Changes to make snmp (forward) compatible with 
            the new version of the crypto application (released in R14).
            As of R14, crypto is implemented using NIFs. Also,
            the API is more strict. </p> 
          <p>Own Id: OTP-8594</p>
        </item>

        <item>
          <p>Auto [agent] Changed default value for the MIB server cache. 
            GC is now on by default. </p>
          <p>Own Id: OTP-8648</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>Encode/decode of Counter64 values larger than 
	    16#7fffffffffffffff (9223372036854775807) failed. </p>
          <p>Own Id: OTP-8563</p>
        </item>

        <item>
          <p>[compiler] Fails to compile non-contiguous BITS. </p>
	  <p>Per Hedeland</p>
          <p>Own Id: OTP-8595</p>
        </item>

        <item>
          <p>[manager] Raise condition causing the manager server process to 
            crash. Unregistering an agent while traffic (set/get-operations) 
            is ongoing could cause a crash in the manager server process 
            (raise condition). </p>
          <p>Own Id: OTP-8646</p>
	  <p>Aux Id: Seq 11585</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.16.2 -->


  <section>
    <title>SNMP Development Toolkit 4.16.1</title>
    <p>Version 4.16.1 supports code replacement in runtime from/to
      version 4.16, 4.15, 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent|manager] Entries in the audit trail log can now be 
            augmented by a sequence number. </p>
          <p>This is enabled by the <c>seqno</c> option, which is part of the 
            <seealso marker="snmp_config#audit_trail_log">Audit Trail Log</seealso> 
            config option. </p>
          <p>See the 
            <seealso marker="snmp_app#configuration_params">reference manual</seealso> 
            or the 
            <seealso marker="snmp_config#configuration_params">Configuring the application</seealso> 
            chapter of the User's Guide for further info. </p> 

          <p>Own Id: OTP-8395</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[manager] Fixed an upgrade/downgrade problem. </p>
          <p>Upgrade/downgrade from/to 4.13.5 did not work for the net-if 
            process. This has now been fixed. </p>
          <p>Own Id: OTP-8481</p>
        </item>

        <item>
          <p>[agent] A minor mnesia related performance improvement. </p>
          <p>Own Id: OTP-8480</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.16.1 -->


  <section>
    <title>SNMP Development Toolkit 4.16</title>
    <p>Version 4.16 supports code replacement in runtime from/to
      version 4.15, 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[agent|manager] Entries in the audit trail log can now be 
            augmented by a sequence number. </p>
          <p>This is enabled by the <c>seqno</c> option, which is part of the 
            <seealso marker="snmp_config#audit_trail_log">Audit Trail Log</seealso> 
            config option. </p>
          <p>See the 
            <seealso marker="snmp_app#configuration_params">reference manual</seealso> 
            or the 
            <seealso marker="snmp_config#configuration_params">Configuring the application</seealso> 
            chapter of the User's Guide for further info. </p> 

          <p>Own Id: OTP-8395</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[manager] Registration of agents using the config file, 
            <seealso marker="snmp_manager_config_files#agents">agents.conf</seealso>, 
            does not work. This has now been corrected. </p>
          <p>Per Hedeland</p>
          <p>Own Id: OTP-8442</p>
        </item>

        <item>
          <p>The config utility 
            (<seealso marker="snmp#config">snmp:config/0</seealso>)
            generated a default notify.conf 
            with a bad name for the starndard trap entry (was "stadard trap", 
            but should have been "standard trap"). This has been corrected. </p>
          <p>Kenji Rikitake</p>
          <p>Own Id: OTP-8433</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.16 -->


  <section>
    <title>SNMP Development Toolkit 4.15</title>

    <p>Version 4.15 supports code replacement in runtime from/to
      version 4.14 and 4.13.5.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->

      <list type="bulleted">
        <item>
          <p>The documentation is now built with open source tools 
            (<em>xsltproc</em> and <em>fop</em>) that exists on most 
            platforms. One visible change is that the frames are removed.</p>
          <p>Own Id: OTP-8249</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] When information from an unknown agent is received,
            it was previously delivered to the default user via calls to all
            the functions of the callback API depending on the info type
            (<c>pdu</c>, <c>trap</c>, <c>report</c> or <c>inform</c>). 
            The problem was that the <c>TargetName</c> argument was useless 
            in this case (only an already known agent has a known/valid 
            <c>TargetName</c>, but the <c>TargetName</c> used in these calls
            was generated "on the fly"). </p>
          <p>This has now been changed so that when a message is received 
            from an unknown agent, then only 
            <seealso marker="snmpm_user#handle_agent">handle_agent</seealso>
            (for the default user) is called, but now this call also has a 
            <c>Type</c> argument, which is 
            <c>pdu | trap | report | inform</c>, depending on what kind of 
            message was actually received, thus making it possible for the 
            user to properly analyze the data received. </p>
	  <p>To handle this, the 
            <seealso marker="snmpm_user">snmpm_user</seealso> behaviour has 
            been updated. </p>
	  <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-8229</p>
	  <!-- <p>Aux Id: Seq 11312</p> -->
        </item>

      </list>

    </section>

  </section> <!-- 4.15 -->


  <section>
    <title>SNMP Development Toolkit 4.14</title>

    <p>Version 4.14 supports code replacement in runtime from/to
      version 4.13.5, 4.13.4, 4.13.3, 4.13.2, 4.13.1 and 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->

      <list type="bulleted">
        <item>
          <p>[compiler] Include object- and notification groups in the 
            compiled mib.
            This will make it possible to import groups from other mibs. </p>
          <p>Also the SNMPv2-MIB-file has been updated to a more
            up-to-date version. </p>
          <p>Own Id: OTP-8223</p>
	  <!-- <p>Aux Id: Seq 11383</p> -->
        </item>

        <item>
          <p>[manager] Added support for message filtering in the
            network interface module provided with the application.
            The component that actually make the filter decisions
            is the network interface filter module. This module
            must implement the 
            <seealso marker="snmpm_network_interface_filter">network interface filter behaviour</seealso>
            for message filtering.
            See also the Configuring chapter of
            the User's Guide to see how to configure this feature. </p>
          <p>See the 
            <seealso marker="snmp_app#configuration_params">configuration</seealso> 
            chapter for more info about the filter options.</p>
          <p>Own Id: OTP-8228</p>
	  <p>Aux Id: Seq 11411</p>
        </item>

        <item>
          <p>The MIBs delivered as part of the application is now
            also available as man pages, section 7. </p>
          <p>Own Id: OTP-8237</p>
	  <!-- <p>Aux Id: Seq 11383</p> -->
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <p>-</p>

      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent] The main agent type header file contained some miss-information 
            regarding the type of the entrytype field of the me-record, causing 
            unneccessary confusion.</p>
          <p>Own Id: OTP-8116</p>
	  <p>Aux Id: Seq 11312</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.14 -->


  <section>
    <title>SNMP Development Toolkit 4.13.5</title>

    <p>Version 4.13.5 supports code replacement in runtime from/to
      version 4.13.4, 4.13.3, 4.13.2, 4.13.1 and 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->

      <list type="bulleted">
        <item>
          <p>[agent] Improved the cache handling of the mib server. </p>
          <p>A number of new functions and config options for the mib server
            cache has been added. </p>
          <p>See 
            <seealso marker="snmpa#invalidate_mibs_cache">invalidate_mibs_cache/0,1</seealso>, 
            <seealso marker="snmpa#enable_mibs_cache">enable_mibs_cache/0,1</seealso>, 
            <seealso marker="snmpa#disable_mibs_cache">disable_mibs_cache/0,1</seealso>, 
            <seealso marker="snmpa#gc_mibs_cache">gc_mibs_cache/0,1,2,3</seealso>, 
            <seealso marker="snmpa#enable_mibs_cache_autogc">enable_mibs_cache_autogc/0,1</seealso>, 
            <seealso marker="snmpa#disable_mibs_cache_autogc">disable_mibs_cache_autogc/0,1</seealso>, 
            <seealso marker="snmpa#update_mibs_cache_age">update_mibs_cache_age/1,2</seealso> and 
            <seealso marker="snmpa#update_mibs_cache_gclimit">update_mibs_cache_gclimit/1,2</seealso> for more info. </p>
          <p>See also the 
            <seealso marker="snmp_app#configuration_params">configuration</seealso> 
            chapter for more info about the mib server cache options.</p>
          <p>Own Id: OTP-8182</p>
	  <p>Aux Id: Seq 11383</p>
        </item>

        <item>
          <p>[agent] A manager could no longer use the SNMPv3 user "initial" 
            as this was interpretated as the first step of the discovery. </p>
          <p>Introduced a new terminating option, <c>trigger_username</c> to
            make it possible to configure the username the agent reacts to. 
            Default is <c>""</c>. </p>
          <p>See the 
            <seealso marker="snmp_app#configuration_params">configuration</seealso> 
            chapter for more info about the discovery options.</p>
          <p>Own Id: OTP-8120</p>
	  <p>Aux Id: Seq 11361</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[agent] The main agent type header file contained some miss-information 
            regarding the type of the entrytype field of the me-record, causing 
            unneccessary confusion.</p>
          <p>Own Id: OTP-8116</p>
	  <p>Aux Id: Seq 11312</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13.5 -->


  <section>
    <title>SNMP Development Toolkit 4.13.4</title>

    <p>Version 4.13.4 supports code replacement in runtime from/to
      version 4.13.3, 4.13.2, 4.13.1 and 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 

      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent] Support for the discovery process. </p>
          <p>The agent can both initiate discovery itself (see the
            <seealso marker="snmp_agent_funct_descr#discovery">discovery</seealso> chapter
            for more info) and respond to discovery initiated by a manager.</p>
          <p>Own Id: OTP-7571</p>
	  <p>Aux Id: Seq 11053</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Originating discovery problems. </p>
          <p>Invalid state variable update during second stage of 
            discovery causes master agent crash. </p>
          <p>Also the net_if process failed to activate socket 
            ({active, once}) after first discovery response was sent. </p>
          <p>Own Id: OTP-8044</p>
	  <p>Aux Id: Seq 11295</p>
        </item>

        <item>
          <p>[agent] Terminating discovery problem. </p>
          <p>The reply to the second stage request should include a 
            varbind with <c>usmStatsNotInTimeWindows</c>.</p>
          <p>Own Id: OTP-8062</p>
	  <p>Aux Id: Seq 11318</p>
        </item>

        <item>
          <p>[agent] Originating discovery improvement. </p>
          <p>Added the ExtraInfo argument to the 
            <seealso marker="snmpa#discovery">discovery</seealso> function. 
            This argument will be passed on to the stage1_finish callback
            function. Also, the 
            <seealso marker="snmpa#discovery">discovery</seealso> function 
            will now always return <c>{ok, ManagerEngineID}</c> on successful 
            discovery. </p>
          <p>The <seealso marker="snmpa_discovery_handler">discovery handler</seealso> 
            behaviour updated accordingly. </p>
          <p>Own Id: OTP-8098</p>
	  <p>Aux Id: Seq 11346</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13.4 -->


  <section>
    <title>SNMP Development Toolkit 4.13.3</title>

    <p>Version 4.13.3 supports code replacement in runtime from/to
      version 4.13.2, 4.13.1 and 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 

      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent] Support for the discovery process. </p>
          <p>The agent can both initiate discovery itself (see the
            <seealso marker="snmp_agent_funct_descr#discovery">discovery</seealso> chapter
            for more info) and respond to discovery initiated by a manager.</p>
          <p>Own Id: OTP-7571</p>
	  <p>Aux Id: Seq 11053</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] A request for an oid of type BITS was actually
            returned as OCTET STRING. </p>
          <p>Values of type BITS are encoded as OCTET STRING,
            which makes it impossible for the decoder to know that 
            they should really be of type BITS. 
            Instead, this has to be done higher up in the stack, where 
            there is knowledge of the MIB (assuming that the mib has 
            been loaded, there is info about the type of the mibentry). </p>
          <p>This problem has now been fixed, but requires that the MIB 
            defining this mib-entry is loaded! </p>
          <p>The utility function 
            <seealso marker="snmpm#oid_to_type">oid_to_type</seealso>
            has been added, for debug purpose. </p>
          <p>The utility function(s)  
            <seealso marker="snmp#octet_string_to_bits">octet_string_to_bits</seealso>
            and 
            <seealso marker="snmp#bits_to_octet_string">bits_to_octet_string</seealso>
            has also been added. These can be used if the user prefers to 
            handle the conversion on their own. </p>
          <p>Own Id: OTP-8015</p>
	  <p>Aux Id: Seq 11285</p>
        </item>

        <item>
          <p>[agent] Fixed some issues with the discovery handling. </p>
          <p>Changed the API of the 
            <seealso marker="snmpa#discovery">discovery</seealso>
            function to solve some 
            of these problems. </p>
          <p>Introduced various options for controlling the discovery
            process. See the 
            <seealso marker="snmp_app#configuration_params">configuration</seealso> 
            chapter for more info about the discovery options.</p>
          <p>Own Id: OTP-8020</p>
	  <p>Aux Id: Seq 11295</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13.3 -->


  <section>
    <title>SNMP Development Toolkit 4.13.2</title>

    <p>Version 4.13.2 supports code replacement in runtime from/to
      version 4.13.1 and 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 

      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent] Support for the discovery process. </p>
          <p>The agent can both initiate discovery itself (see the
            <seealso marker="snmp_agent_funct_descr#discovery">discovery</seealso> chapter
            for more info) and respond to discovery initiated by a manager.</p>
          <p>Own Id: OTP-7571</p>
	  <p>Aux Id: Seq 11053</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] Failure during downed user cleanup.
            As part of the cleanup after a crashed user,
            the manager attempts to unregister the agents
            registered by this user. This however failed,
            causing a server crash. </p>
          <p>Own Id: OTP-7961</p>
	  <p>Aux Id: Seq 11275</p>
        </item>

        <item>
          <p>[manager] Incorrectly documented value type for 
            IpAddress (ip). The value type for IpAddress is
            documented as ip but is actually ia. The value type
            ip has been added. The old (not documented) value
            type ia still works. </p>
          <p>Own Id: OTP-7977</p>
	  <p>Aux Id: Seq 11279</p>
        </item>

        <item>
          <p>[manager] EngineId lookup fails when using version-3. </p>
          <p>Own Id: OTP-7983</p>
	  <p>Aux Id: Seq 11275</p>
        </item>

        <item>
          <p>[agent] As of version 4.13 the possible return values
            of the function 
            <seealso marker="snmpa_mpd#process_packet">snmpa_mpd:process_packet/4</seealso> 
            changed, but this was not documented. </p>
          <p>Own Id: OTP-7989</p>
	  <p>Aux Id: Seq 11275</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13.2 -->

  <section>
    <title>SNMP Development Toolkit 4.13.1</title>

    <p>Version 4.13.1 supports code replacement in runtime from/to
      version 4.13.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 

      <!-- 
      <list type="bulleted">
        <item>
          <p>[agent] Support for the discovery process. </p>
          <p>The agent can both initiate discovery itself (see the
            <seealso marker="snmp_agent_funct_descr#discovery">discovery</seealso> chapter
            for more info) and respond to discovery initiated by a manager.</p>
          <p>Own Id: OTP-7571</p>
	  <p>Aux Id: Seq 11053</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] Registration of users had some issues. </p>
          <p>Not all of the registration functions where actually exported
            (<seealso marker="snmpm#register_user">register_user/4</seealso> 
            and
            <seealso marker="snmpm#register_user_monitor">register_user_monitor/4</seealso>). 
            This has now been fixed. </p>
          <p>Also, the registration did not succeed unless
            user implemented the *new* behaviour. This has now
            also been fixed (registration succeeds if the user
            implements either the new (i.e. updated 
            <seealso marker="snmpm_user">snmpm_user</seealso>) 
            or the old user behaviour (<c>snmpm_user_old</c>)). </p>
          <p>Own Id: OTP-7902</p>
	  <p>Aux Id: Seq 11240</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13.1 -->

  <section>
    <title>SNMP Development Toolkit 4.13</title>
<!--
    <p>Version 4.13 supports code replacement in runtime from/to
      version 4.12.1.</p>
-->

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Support for the discovery process. </p>
          <p>The agent can both initiate discovery itself (see the
            <seealso marker="snmp_agent_funct_descr#discovery">discovery</seealso> chapter
            for more info) and respond to discovery initiated by a manager.</p>
          <p>Own Id: OTP-7571</p>
	  <p>Aux Id: Seq 11053</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Unnecessary use of math:pow/2 could cause problems
            on systems without floating point support. </p>
          <p>Per Hedeland</p>
          <p>Own Id: OTP-7735</p>
	  <!-- <p>Aux Id: Seq 10966</p> -->
        </item>

        <item>
          <p>[manager] A major flaw was discovered with the agent handling. </p>
          <p>First, <c>TargetName</c> was never used as intended, as a unique
            identifier for the target (agent in this case). </p>
          <p>Second, <c>TargetName</c> had a <em>default value</em>, which meant 
            that several agents could have the same <c>TargetName</c>, causing
            unpredictable behaviour in the manager. </p>
          <p>Third, <c>EngineID</c> was not a mandatory config option and had
            furthermore also a <em>default value</em>. </p>

          <p>These problems has been solved in the following way: </p>
          <p>First, a new set of api functions has been introduced (and documented):
            <seealso marker="snmpm#register_user">register_user/4</seealso>,
            <seealso marker="snmpm#register_user_monitor">register_user_monitor/4</seealso>,
            <seealso marker="snmpm#register_agent">register_agent/3</seealso>,
            <seealso marker="snmpm#unregister_agent">unregister_agent/2</seealso>,
            <seealso marker="snmpm#agent_info">agent_info/2</seealso>,
            <seealso marker="snmpm#update_agent_info">update_agent_info/4</seealso>,
            <seealso marker="snmpm#sync_get">sync_get/3,4,5,6</seealso>,
            <seealso marker="snmpm#async_get">async_get/3,4,5,6</seealso>,
            <seealso marker="snmpm#sync_get_next">sync_get_next/3,4,5,6</seealso>,
            <seealso marker="snmpm#async_get_next">async_get_next/3,4,5,6</seealso>,
            <seealso marker="snmpm#sync_set">sync_set/3,4,5,6</seealso>,
            <seealso marker="snmpm#async_set">async_set/3,4,5,6</seealso>,
            <seealso marker="snmpm#sync_get_bulk">sync_get_bulk/5,6,7,8</seealso> and
            <seealso marker="snmpm#async_get_bulk">async_get_bulk/5,6,7,8</seealso> 
            that all use <c>TargetName</c> (and not, as previously, <c>Addr</c>
            and <c>Port</c>) to identify the agent (also the return value of 
            <seealso marker="snmpm#which_agents">which_agents</seealso> has 
            been changed). </p> 
          <p>Second, for backward compatibility, the old functions still 
            exist, but are no longer documented and are now wrappers for the 
            new functions, including erroneous default value for EngineID and 
            all. The TargetName is however generated from the provided 
            <c>Addr</c>, <c>Port</c> and <c>Version</c> config options. </p>
           <p>Third, the behaviour of the 
             <seealso marker="snmpm_user">SNMP manager user</seealso> has
             been changed to reflect this, i.e. 
             <seealso marker="snmpm_user#handle_pdu">handle_pdu/4</seealso>,
             <seealso marker="snmpm_user#handle_trap">handle_trap/3</seealso>,
             <seealso marker="snmpm_user#handle_inform">handle_inform/3</seealso>, 
             <seealso marker="snmpm_user#handle_report">handle_report/3</seealso> 
             and the return-value of 
             <seealso marker="snmpm_user#handle_agent">handle_agent/4</seealso>.
             The old (non-documented) callback-functions (using Addr and Port) 
             will still be called if the agent was registered using the old 
             registration functions. </p>
          
          <p>Own Id: OTP-7836</p>
	  <!-- <p>Aux Id: Seq 10966</p> -->
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.13 -->

  <section>
    <title>SNMP Development Toolkit 4.12.2</title>
    <p>Version 4.12.2 supports code replacement in runtime from/to
      version 4.12.1, 4.12, 4.11.2, 4.11.1 and 4.11.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
      <!-- 
      <list type="bulleted">
        <item>
        <item>
          <p>[agent] Improvement of the inform reporting.
            It was previously not certain how many acks an
            application received, 0, 1 or 2. This has now been
            fixed, so that only 1 (one) ack is issued. </p> 
          <p>Per Hedeland</p>
          <p>Own Id: OTP-7525</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Bad session cache (usm+camv-info) invalidation 
            could cause user crash, through call(s) to (a number of) 
            MIB API function(s) (undefined function). </p>
          <p>Own Id: OTP-7868</p>
	  <!-- <p>Aux Id: Seq 11124</p> -->
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.12.2 -->

  <section>
    <title>SNMP Development Toolkit 4.12.1</title>
    <p>Version 4.12.1 supports code replacement in runtime from/to
      version 4.12, 4.11.2, 4.11.1 and 4.11.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
      <!-- 
      <list type="bulleted">
        <item>
        <item>
          <p>[agent] Improvement of the inform reporting.
            It was previously not certain how many acks an
            application received, 0, 1 or 2. This has now been
            fixed, so that only 1 (one) ack is issued. </p> 
          <p>Per Hedeland</p>
          <p>Own Id: OTP-7525</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>Logging of messages with the GetBulk-request PDU
            incorrectly produced an erroneous entry in the
            log: "An error occurred". </p>
          <p>The reason for this was that the PDU-fields
            error_status and error_index is re-used for
            Non-repeaters and Max-repetitions for
            GetBulk-request PDUs, but this was not handled
            by the logging code. </p>
          <p>Own Id: OTP-7695</p>
	  <p>Aux Id: Seq 11124</p>
        </item>

        <item>
          <p>[agent] An attempt to set the row status to active for an 
            notReady table row, could result in an "inconsistentValue" 
            error. </p>
          <p>The same problem existed when attempting to set row status 
            to notInService for a row in notReady. </p>
          <p>Serge Aleynikov</p>
          <p>Own Id: OTP-7698</p>
	  <!-- <p>Aux Id: Seq 10966</p> -->
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.12.1 -->

  <section>
    <title>SNMP Development Toolkit 4.12</title>
    <p>Version 4.12 supports code replacement in runtime from/to
      version 4.11.2, 4.11.1 and 4.11.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[agent] A simple lookup cache has been added to improve 
            the mib server lookup performance. </p>
          <p>This can be disabled with the mib_server 
            <seealso marker="snmp_app">cache</seealso> option. </p> 
          <p>Own Id: OTP-7346</p>
        </item>

        <item>
          <p>[agent] Improvement of the inform reporting.
            It was previously not certain how many acks an
            application received, 0, 1 or 2. This has now been
            fixed, so that only 1 (one) ack is issued. </p> 
          <p>Per Hedeland</p>
          <p>Own Id: OTP-7525</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <p>-</p>
      <!-- 
      <list type="bulleted">
        <item>
          <p>[manager] Encryption error when attempting to send
            version 3 inform-requests. </p>
          <p>Own Id: OTP-7432</p>
	  <p>Aux Id: Seq 10966</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.12 -->

  <section>
    <title>SNMP Development Toolkit 4.11.2</title>
    <p>Version 4.11.2 supports code replacement in runtime from/to
      version 4.11.1 and 4.11. </p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p> 
      <!-- 
      <list type="bulleted">
        <item>
	  <p>Added utility functions for transforming DateAndTime
            as [int()] to strings; 
            <seealso marker="snmp#dat2s">date_and_time_to_string/2</seealso>
            and  
            <seealso marker="snmp#dat2s2">date_and_time_to_string2/1</seealso>. </p>
          <p>Also added new validation function 
            <seealso marker="snmp#vdat">validate_date_and_time/2</seealso>. </p>
	  <p>Own Id: OTP-7412</p>
	  <p>Aux Id: Seq 10987</p>
        </item>
      </list>
      -->
    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] Erroneous engine-id check when receiving version 3 
            informs. </p>
          <p>Own Id: OTP-7570</p>
	  <p>Aux Id: Seq 11060</p>
        </item>

        <item>
	  <p>Receiving an snmp message with a very large version
            number could cause the erlang node to run out of
            memory and consequently crash. </p>
          <p>The standard specifies the snmp version as an
            (unlimited) INTEGER, but today only
            0 (version 1), 1 (version 2) and 3 (version 3) is
            actually used. So, when decoding a message, a limit
            has been put on the snmp version integer in order
            to not allow this kind of a problem. </p>
	  <p>Own Id: OTP-7575</p>
	  <p>Aux Id: Seq 11064</p>
        </item>

      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.11.2 -->


  <section>
    <title>SNMP Development Toolkit 4.11.1</title>
    <p>Version 4.11.1 supports code replacement in runtime from/to
      version 4.11.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[compiler] The MIB compiler did not retrieve the REFERENCE part
            of a SNMP MIB definition. </p>
          <p>This problem has been partly solved. For SNMP tables, 
            the assocList field of the tables mib-entry record now contains 
            this info (as <c>{reference, string()}</c>), <em>if</em> the 
            MIB was compiled with the compiler option <em>+reference</em>. </p>
          <p>This solution is temporary, until such time as a permanent
            solution (and probably not backward compatible) is devised, which
            retrieves and stores all REFERENCE part(s) of a MIB. </p>
          <p>See the 
            <seealso marker="snmpc#compiler_opts">compiler options</seealso> 
            for more info. </p> 

          <p>Serge Aleynikov</p>
          <p>Own Id: OTP-7426</p>
        </item>

        <item>
	  <p>Added utility functions for transforming DateAndTime
            as [int()] to strings; 
            <seealso marker="snmp#dat2s">date_and_time_to_string/2</seealso>
            and  
            <seealso marker="snmp#dat2s2">date_and_time_to_string2/1</seealso>. </p>
          <p>Also added new validation function 
            <seealso marker="snmp#vdat">validate_date_and_time/2</seealso>. </p>
	  <p>Own Id: OTP-7412</p>
	  <p>Aux Id: Seq 10987</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] Encryption error when attempting to send
            version 3 inform-requests. </p>
          <p>Own Id: OTP-7432</p>
	  <p>Aux Id: Seq 10966</p>
        </item>

      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.11.1 -->

  <section>
    <title>SNMP Development Toolkit 4.11</title>
    <p>Version 4.11 supports code replacement in runtime from/to
      version 4.10.3, 4.10.2, 4.10.1 and 4.10.</p>

    <section>
      <title>Improvements and new features</title>
      <!-- 
      <p>-</p> 
      -->
      <list type="bulleted">
        <item>
          <p>[agent] Performance improvements in the case when an SNMP 
            manager performs an snmpwalk. </p>
          <p>Martin Bj&ouml;rklund</p>
          <p>Own Id: OTP-7201</p>
        </item>

        <item>
          <p>The API for sending inform(s) has been improved. Also
            the documentation has been corrected and updated. See 
            <seealso marker="snmpa#send_notification">snmpa:send_notification</seealso> and 
            <seealso marker="snmpa_notification_delivery_info_receiver">snmpa_notification_delivery_info_receiver</seealso> 
            for more info.</p>
          <p>Own Id: OTP-7287</p>
          <p>Aux Id: Seq 10926</p>
        </item>

        <item>
	  <p>[agent] Performance of the internal database (local-db) 
           has been improved.</p>
	  <p>Own Id: OTP-7319</p>
	  <p>Aux Id: Seq 10942</p>
        </item>

        <item>
	  <p>[agent] Added utility functions,
            <seealso marker="snmpa#restart_worker">snmpa:restart_worker/0,1</seealso> and 
            <seealso marker="snmpa#restart_set_worker">snmpa:restart_set_worker/0,1</seealso>, 
            for restarting the agent worker processes (in case the agent is
            multi-threaded).</p>
	  <p>Own Id: OTP-7369</p>
        </item>

        <item>
	  <p>Add utility function to 
            <seealso marker="snmp#read_mib">read</seealso> 
            a compiled mib. </p>
	  <p>Own Id: OTP-7371</p>
        </item>

      </list>
    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!-- 
      <p>-</p>
      -->
      <list type="bulleted">
        <item>
          <p>[manager] Encryption error when attempting to send
            version 3 inform-requests. </p>
          <p>Own Id: OTP-7377</p>
	  <p>Aux Id: Seq 10966</p>
        </item>

      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.11 -->

  <!-- section>
    <title>Release notes history</title>
    <p>For information about older versions see
      <url href="part_notes_history_frame.html">release notes history</url>.</p>
  </section -->
</chapter>