## 1 SNMP Release Notes

### 1.1 SNMP Development Toolkit v3.3.5

Version 3.3.5 supports code replacement in runtime from/to version 3.3.4, 3.3.3 and 3.3.2

#### 1.1.1 Improvements and new features

- When opening a log file, the failure reason was not checked. Instead it was assumed to be `{badarg,size}` (when opened without the size option, this means the file does not exist). This is usually correct, but just to be on the safe side the test has beem changed to make sure that no other results get through.
  Own Id: OTP-4282
  Aux Id: Seq 7312
- Added possiblillity to specify own error report module (instead of the default, snmp_error). This is done with a new application config directive: `snmp_error_report_mod`, see configuration parameters. Also added a size limit to the snmp_error module. Messages larger then 1024 chars will be truncated. Added a very simple error report module, `snmp_error_io`, which writes the message to stdout using the `io` module (without any limitations).
  Own Id: OTP-4279
  Aux Id: Seq 7309
- Test manager does not send error message in quiet mode. If the request to the manager contains an erroneous oid, no information is sent back to the client (that started the manager). See quiet config parameter for the new reply value.
  Added two new functions for oid to/from aliasname conversion, to be used by the test manager users, see oid_to_name and name_to_oid.
  Own Id: OTP-4250
  Aux Id: Seq 7270

#### 1.1.2 Reported Fixed Bugs and Malfunctions

- Handling of large erroneous SNMP messages corrected. Encoding of the reply to these messages failed due to a bug in the length encoding. Also corrected counter increments.
  Own Id: OTP-4278
  Aux Id: Seq 7309

### 1.2 SNMP Development Toolkit v3.3.4

Version 3.3.4 supports code replacement in runtime from/to version 3.3.3, 3.3.2, 3.3.1, 3.3.0 and 3.2.2 (with the exception of what's mentioned in the version 3.3.0 note).

#### 1.2.1 Improvements and new features

#### 1.2.2 Reported Fixed Bugs and Malfunctions

- Crypto keys changed from string to list
  Own Id: OTP-4206
  Aux Id: Seq 7207
- SNMP date diff check changed according to RFC 2579 (was according to RFC 1903).
  Own Id: OTP-4209
  Aux Id: Seq 7185

### 1.3 SNMP Development Toolkit v3.3.3

Version 3.3.3 supports code replacement in runtime from/to version 3.3.2, 3.3.1, 3.3.0 and 3.2.2 (with the exception of what's mentioned in the version 3.3.0 note).

#### 1.3.1 Improvements and new features

#### 1.3.2 Reported Fixed Bugs and Malfunctions

- Erroneous macro defines corrected.
  Own Id: OTP-4006
- Storage of mib data using dets did not work (see OTP-3740).
  Own Id: OTP-4076
- Error according to section 3.2.7a of RFC 2274/2574 reported with the wrong OID (usmStatsNotInTimeWindows instead of usmStatsNotInTimeWindows.0)
  Own Id: OTP-4090

### 1.4 SNMP Development Toolkit v3.3.2

Version 3.3.2 supports code replacement in runtime from/to version 3.3.1, 3.3.0 and 3.2.2 (with the exception of what's mentioned in the version 3.3.0 note).

#### 1.4.1 Improvements and new features

#### 1.4.2 Reported Fixed Bugs and Malfunctions

- snmp_net_if:subtr/2 don't handle megaseconds
  Own Id: OTP-3920
  Aux Id: Seq 5174
- The mib compiler does not detect if an notification and an ordinary mib entry (OBJECT-IDENTITY) has the same OID.
  Own Id: OTP-3986
  Aux Id: Seq 5256

### 1.5 SNMP Development Toolkit v3.3.1

Version 3.3.1 supports code replacement in runtime from/to version 3.3.0 and 3.2.2 (with the exception of what's mentioned in the version 3.3.0 note).

#### 1.5.1 Improvements and new features

- The UDP based Network Interface included in this application, snmp_net_if, now sets the UDP receive buffer size, according to the snmp_net_if_recbuf sys config option. If this option is not present, the default value is used (i.e. it is not set at all). There is no need to set the send buffer since the size of the send buffer is adjusted automatically. Note that the underlying IP implementation defines the maximum buffer size.
  Own Id: OTP-3874
  Aux Id: seq5103

#### 1.5.2 Reported Fixed Bugs and Malfunctions

- Failure to retrieve mib info. This is information (specifically a list of loaded mibs) is retrieved when performing a takover. Could cause a takeover to fail.
  Own Id: OTP-3890
  Aux Id: seq5123
- Error in mib conversion for notifications. This error exist only in version 3.3.0.
  Own Id: OTP-3875
  Aux Id: seq4936
- SNMP loop if damaged snmp db. If a table row has been created with own RowIndex (key) of "", this will cause an infinit loop when traversing the table (this is done when the SNMP application at startup performs the table cleanup). This happens if:
  - Empty string for CommunityIndex in config file community.conf.
  - Empty string for NotifyName in config file notify.conf.
  - Empty string for TargetName in config file target_addr.conf.
  - Empty string for ParamsName in config file target_params.conf.
  Own Id: OTP-3881
  Aux Id: seq5113

### 1.6 SNMP Development Toolkit v3.3.0

Version 3.3.0 supports code replacement in runtime from/to version 3.2.2.

| You cannot downgrade if you are using dets or mnesia for mib data storage, since previous versions only supported ets.

#### 1.6.1 Improvements and new features

- The agent can now load mibs compiled with a pre 3.2.0 mib compiler.
  Own Id: OTP-3833
- Added a new interface function to retrieve the index types of the table info. This was previously internal info only. See the generic functions.
  Own Id: OTP-3816
  Aux Id: seq5053
- It is now possible to store mib data in ets, dets and mnesia. Default is ets. See configuration parameters on how to configure this.
  Own Id: OTP-3740
  Aux Id: seq4947

#### 1.6.2 Reported Fixed Bugs and Malfunctions

- The EVA application called undefined SNMP log conversion function.
  Own Id: OTP-3733
- Snmp manager 'get-bulk-request' failure.
  This is actually a UDP problem (OTP-3807). In R7 the default receive buffer, recbuf, size of a UDP socket has incorrectly been changed to 1024 bytes. The problem is that when a message bigger then the recbuf size is received it is cut and sizeof(recbuf) bytes is delivered (this is not the correct behaviour). The simple snmp manager app included in this application did not explicitly set the size of recbuf.
  So, in R7 a get-bulk-request could easily exceed 1024 bytes, resulting in an erroneous message. The size of recbuf for the snmp manager app is now configurable (`{recbuf,integer()}`, see manager options).
  Note that the maximum size of outgoing/incoming message should be set to a value less then or equal to the recbuf size! See for example snmpEngineMaxMessageSize in SNMP_FRAMEWORK_MIB.
  Note that this problem exists in R7 only!
  Own Id: OTP-3797
  Aux Id: seq5008

### 1.7 SNMP Development Toolkit v3.2.2

Version 3.2.2 supports code replacement in runtime from/to version:

- OTP version R7: 3.2.1 and 3.2.0,
- OTP version R6: 3.1.4 and 3.1.3,
- OTP version R5: 3.0.9.4, 3.0.9.3 and 3.0.9.2.

#### 1.7.1 Improvements and new features

- It is now possible to register/unregister for notification of changes stored (permanetly, i.e. on disk) in snmp_local_db.
  Own Id: OTP-3704
- Added direct access (read) functions to the symbolic store for faster access (accessible throw the snmp module).
  Own Id: OTP-3725

### 1.8 SNMP Development Toolkit v3.2.1

Version 3.2.1 supports code replacement in runtime from/to version 3.2.0, 3.1.4, 3.1.3, 3.0.9.4, 3.0.9.3 and 3.0.9.2.

#### 1.8.1 Reported Fixed Bugs and Malfunctions

- Bad-arith in snmp_pdus (error case not handled). Erronous user provided messages that could not be encoded caused the application to crash.
  Own Id: OTP-3688
  Aux Id: seq4874

### 1.9 SNMP Development Toolkit v3.2.0

Version 3.2.0 supports code replacement in runtime from/to version 3.1.4, 3.1.3 and 3.0.9.2.

| When importing MIBs, ensure that the imported MIBs as well as the importing MIB are compiled using the same version of the SNMP-compiler. The required interface of the Net if module has changed.

#### 1.9.1 Improvements and new features

- Debugging has been improved. It is now possible to "debug" all named processes (individually) of the snmp application. See the snmp module for details.
- Filter (audit trail) logs on timestamp.
  Own Id: OTP-3600
- The MIB-compilator has been improved. It is possible to include Description-field into compiled MIB.
  Own Id: OTP-3538

#### 1.9.2 Reported Fixed Bugs and Malfunctions

- Failure converting audit trace log to text file.
  Own Id: OTP-3649, OTP-3650
  Aux Id: seq4844

### 1.10 SNMP Development Toolkit v3.1.4

Version 3.1.4 supports code replacement in runtime from/to version 3.1.3.

#### 1.10.1 Improvements and new features

- Debugging has been improved. It is now possible to "debug" all named processes (individually) of the snmp application. See the snmp module for details.

#### 1.10.2 Reported Fixed Bugs and Malfunctions

- Erroneous check for duplicate trap/mib entries. A check for duplicate mibentries has been added. This check can be overridden with the sys config tuple: `{snmp_mibentry_override,bool()}`. The check for duplicate trap entries was erroneous, only the first trapentry in a mib was checked. This check can now be overridden with the sys config tupple: `{snmp_trapentry_override,bool()}`. Default values in both cases are `false` (no override, which means the check is made).
  Own Id: OTP-3601
- Cloning of user from template user failure.
  Own Id: OTP-3596
  Aux Id: seq4584
- Problem with deprecated (mib-) definitions.
  A new option for the MIB-compilator is used. The option is deprecated, will get around the problem with deprecated definition.
  Own Id: OTP-3574
  Aux Id: seq4528
- Trap sending example in chapter Manual implementation corrected.
  Own Id: OTP-3353

### 1.11 SNMP Development Toolkit v3.1.3

Version 3.1.3 supports code replacement in runtime from version 3.1.2.

#### 1.11.1 Improvements and new features

#### 1.11.2 Reported Fixed Bugs and Malfunctions

- SNMPv3 discovery process does not work.
  Own Id: OTP-3542
  Aux Id: seq4449
- Corrupt (snmp_local_db) log files cause snmp crash. Changes to the local db is stored on disk in a logfile. In a takeover senario the new snmp will try to restore the database by reading the ets-table on disk and then update this with the transactions stored in the logfile. If the logfile is corrupt, this caused a crash.
  Own Id: OTP-3537
  Aux Id: seq4471
- Return value genErr from GET instrumentation function treated as not accepted.
  Own Id: OTP-3534
  Aux Id: seq4437
- snmp:date_and_time() rewritten to not rely on erlang:now()
  Own Id: OTP-3525
  Aux Id: seq4391
- the SNMP reportableFlag was set in response messages, which it should not.
  Own Id: OTP-3416
  Aux Id: seq4200.
- Failure to check if MIBs were already loaded at take-over.
  Own Id: OTP-3411
  Aux Id: seq4155
- Unneccessary print-outs in snmp_net_if.
  Own Id: OTP-3410
  Aux Id: seq4241
- A crash-report from disk_log was generated when the SNMP agent was started for the very first time.
  Own Id: OTP-3393
  Aux Id: seq4211
- The SNMP agent crashed (in snmp_pdus:enc_oid_tag) during initialization of table. Proper check of object identifier values has been added.
  Own Id: OTP-3378
  Aux Id: seq4155.

### 1.12 SNMP Development Toolkit v3.1.2

Version 3.1.2 supports code replacement in runtime from versions 3.1.1 and 3.0.6.

#### 1.12.1 Improvements and new features

- The fact that the MIBs SNMPv2-SMI, RFC-1215, RFC-1212, SNMPv2-TC, SNMPv2-CONF and RFC1155-SMI are compiler built-ins, has been added to the compiler documentation.
  Own Id: OTP-3316
  Aux Id:
- The agent option `authentication_service` has been reintroduced. This option is part of an SNMP internal API.
  Own Id: OTP-3324
  Aux Id:
- It has been clarified in the documentation, that the value of `snmpEngineID` should not be just a simple string, but has to follow the conventions specified in RFC 2271/2571.
  Own Id: OTP-3350
  Aux Id:

#### 1.12.2 Reported Fixed Bugs and Malfunctions

- If two Erlang nodes are started on the same host, and each node starts an SNMP agent, and if both agents use the same UDP port, the agent that starts last, will completely control the port. The reason for this is that the UDP port is opened with a reuse directive.
  A new option `no_reuse_address`, which, if set, causes the reuse directive not to be set.
  Own Id: OTP-3317
  Aux Id: seq4008
- Debug printouts from `snmp_net_if` appeared even when the debug flag was not set. This has been corrected.
  Own Id: OTP-3345
  Aux Id: seq4091

### 1.13 SNMP Development Toolkit v3.1.1

#### 1.13.1 Improvements and new features

- The audit trail log has been improved. Now each log item also contains a time stamp. Also the text format of a log (produced by a call to `snmp:log_to_txt`) has been changed to be more "line oriented".
  The function `snmp:log_to_txt/4` has been added.
  Own Id: OTP-3261
  Aux Id: seq3884, OTP-3253
- Each item in an audit trail text log file (produced by `snmp:log_to_txt`) now has a trailing TAB character, and any TAB character in the body of a text item is replaced by ESC TAB.
  Own Id: OTP-3282
  Aux Id: seq3969
- The function `snmp:log_to_txt/5` has been added, so that not only the log name but also the log file name can be specified when converting an audit trail log to text format.
  Own Id: OTP-3298
  Aux Id:
- A new optional environment variable `bind_to_ip_addess` has been added, controlling if the agent should bind to the specific IP address or not.
  Own Id: OTP-3293
  Aux Id:

#### 1.13.2 Reported Fixed Bugs and Malfunctions

- Conversion of a log to text format could crash SNMP if the log was already open.
  Own Id: OTP-3261
  Aux Id: seq3884
- The BER encoding of integers did not follow the ASN.1 BER encoding rules.
  Own Id: OTP-3274
  Aux Id: seq3960
- SNMP did not start if the audit disk_log file was corrupt.
  Own Id: OTP-3290
  Aux Id:
- SNMP was not backward compatible with instrumentation functions that returned `{noValue, unSpecified}` (the SNMP agent crashed). This has been changed by silently transforming such a return value to `{noValue, noSuchInstance}`.
  Own Id: OTP-3303
  Aux Id: seq3975
- The header file `snmp_vacm.hrl` was missing in the SNMP `src` directory.
  Own Id: OTP-3327
  Aux Id:

#### 1.13.3 Incompatibilities with v3.1

- Applications that parses the audit trail log text files have to be rewritten.

### 1.14 SNMP Development Toolkit v3.1

#### 1.14.1 Improvement and new features

- Adaption to new format of exit codes.

### 1.15 SNMP Development Toolkit v3.0.3

#### 1.15.1 Improvements and new features

- A new function `snmp:date_and_time_to_string/1` has been added. It converts a DateAndTime octet string to a string, according to the DISPLAY-HINT in RFC1903.
- A new function `snmp_target_mib:set_target_engine_id/2` has been added. It

#### 1.15.2 Reported Fixed Bugs and Malfunctions

- get-next on vacmAccessTable finds all columns.
  Own Id: OTP-3187
  Aux Id: seq3647
- The functions in the module `snmp` for manipulating DateAndTime objects didn't handle the year component correctly. Specifically, the two octets representing the year should be coded in hex.
  NOTE: see "Incompatibles" below.
  Own Id: OTP-3189
  Aux Id: seq3655
- It is now possible to create new rows in `snmpTargetAddrTable` in `SNMP-TARGET-MIB`. The engine id associated with the target is initialized to "" by default. This can be changed by using the new function `snmp_target_mib:set_target_engine_id/2`.

#### 1.15.3 Incompatibilities with v3.0.*

- Applications that uses the DateAndTime manipulating functions might need to be rewritten to handle the correct coding of the year component. For example, a function that prints a DateAndTime value needs to be changed. The new function `snmp:date_and_time_to_string/1` can be used.

### 1.16 SNMP Development Toolkit v3.0.2

#### 1.16.1 Reported Fixed Bugs and Malfunctions

- The agent now starts correctly when a Audit Trail Log is used.
  Own Id: OTP-3137
  Aux Id: seq3594

### 1.17 SNMP Development Toolkit v3.0.1

#### 1.17.1 Improvements and new features

- A new function `snmp:change_log_size/1` has been added to dynamically change the size of the Audit Trail Log.
  Own Id: OTP-2989
  Aux Id: seq1499

#### 1.17.2 Reported Fixed Bugs and Malfunctions

- The function `snmp:get/2` didn't preserve the order of its input variable list. The order of the elements in the returned list was not the same as in the input list.
  Own Id: OTP-3134
  Aux Id: seq1727
- The record `message` in `snmp_types.hrl` has been changed to reflect the new SNMPv3 message format. Specifically, the `community` field has changed name to `vsn_hdr`. If the message version is v1 or v2c, it is still just the community string, but if the version is v3, it is a `v3_hdr` record. This change only affects applications that encodes / decodes SNMP messages using the module `snmp_pdus`. If an application wants to use this new record (i.e. it needs to use SNMPv3), it must define the constant `SNMP_USE_V3` before the header file is included. This ensures that old applications that uses the old definition of `message` and don't use v3 don't have to be modified.

### 1.18 SNMP Development Toolkit v3.0

#### 1.18.1 Improvements and new features

- The agent is multi-lingual, and understands SNMPv1, SNMPv2c, and SNMPv3. Full SNMPv3 support is given, including encryption and authentication, but the optional proxy and notification filtering features are not implemented.
- A new function `snmp:send_notification/6` is added, which can be used to specify from which context a notification is sent.
- All relevant standard MIBs are included in the `mibs/` directory in the distribution, for reference purposes.
- The agent uses the application `crypto` for authentication and encryption. If these functions are to be used, the `crypto` application must be started before the `snmp` application.
- The manager supports SNMPv3. A few new options has been added to the start function `snmp_mgr:start/1`.

#### 1.18.2 Reported Fixed Bugs and Malfunctions

- The Mib Compiler now handles forward references in OBJECT IDENTIFIERs.
  Own Id: OTP-2942
  Aux Id: seq1415
- GET-NEXT on an empty table implemented with `snmp_generic` returns correctly.
  Own Id: OTP-2979
  Aux Id: seq1496
- The functions `snmp:log_to_text/2,3` can be used when the log is opened and in use by the agent.
  Own Id: OTP-2994
  Aux Id: seq1508

#### 1.18.3 Incompatibilities with v2.2.x

- The OTP-SNMPEA-MIB is not used anymore. The functionality is provided by standard MIBs. This means that managers that are using this MIB should use the standard MIBs instead. Applications that include the header file `OTP-SNMPEA-MIB.hrl` need to be changed.
- The handling of data in the configuration files vs. data in the actual tables is reworked and made consistent. This means that data changed by a manager survives a reboot, if the manager so wishes (by using the StorageType columns in the tables). There is a new configuration parameter, `force_config_load` which can be set to `true` to get the old behaviour, i.e. that the configuration files are always read at startup.
- The configuration files `address.conf`, `view.conf` and `trap_dest.conf` are not used anymore. The formats of `agent.conf` and `community.conf` have changed. `context.conf`, `usm.conf` and `vacm.conf` are new files. If the agent is started with the old files, it will convert them to the new files. Note however, that all information is not available in the old files. Thus, it is recommended to check the configuration files manually, or re-generate them using `snmp:config/0`.
- The module `snmp_mpc` has changed name to `snmp_mpd`, and it is now documented. It should be called only from a `net if` process.

### 1.19 SNMP Development Toolkit v2.2.3

#### 1.19.1 Reported Fixed Bugs and Malfunctions

- When issuing a GET-NEXT request which contains more than one column from a table, and the table is empty, an erroneus GET-RESPONSE was sent to the manager. The agent failed to locate the next object for all columns.
  Own Id: OTP-2979

### 1.20 SNMP Development Toolkit v2.2.2

#### 1.20.1 Reported Fixed Bugs and Malfunctions

- The function `snmp:validate_date_and_time/1` now works for all valid times.
  Own Id: OTP-2776
  Aux Id: seq1238
- The MIB compiler now handles DEFVALs specified as bit strings (e.g. `'10010'b`.
  Own Id: OTP-2826
  Aux Id: seq1285
- The MIB compiler now handles DEFVALs for `Opaque` objects. Such a DEFVAL must be in string format, e.g. `'c0fa'H`,
  Own Id: OTP-2827
  Aux Id: seq1285
- The MIB compiler now handles DEFVALs with no bits set for `BITS` objetcs.
  Own Id: OTP-2827
  Aux Id: seq1285
- The MIB compiler gives better error messages when erroneous DEFVALs are detected.
  Own Id: OTP-2827
  Aux Id: seq1285
- The MIB compiler gives better error messages when erroneous table definitions are detected.
  Own Id: OTP-2832

### 1.21 SNMP Development Toolkit v2.2.1

#### 1.21.1 Reported Fixed Bugs and Malfunctions

- The example mib EX1-MIB in the user's guide compiles.
  Own Id: OTP-2576
  Aux Id: seq933
- The supervisor of the mibs has a correct shutdown time (infinity instead of 2 secs).
  Own Id: OTP-2606
  Aux Id: seq947
- The automatic conversion of trap_dest.conf to the new notify.conf, target_addres.conf, and target_params.conf now gives an error message if the conversion fails.
  Own Id: OTP-2647
- The UDP port used by the agent is now opened with the flag `reuseaddr` set to true.
  Own Id: OTP-2655
- `authenticationFailure` are now sent correctly.
  Own Id: OTP-2690
- A `get` operation that refers to a `not-accessible` object now returns the correct error code.
  Own Id: OTP-2691
- The counter `snmpInTotalsetVars` is now updated properly.
  Own Id: OTP-2694

### 1.22 SNMP Development Toolkit v2.2

#### 1.22.1 Improvements and new features

- The agent and `snmp_mgr` support Inform-Requests when sending SNMPv2 notifications, as defined in rfc2273. This means that it is now possible to send a notification and have the agent wait for an acknowledgement from the manager. See the User's guide, "Notification Sending" for a description of the mechanism.
- The agent uses the SNMP-NOTIFICATION-MIB and SNMP-TARGET-MIB from rfc2273 to select notification destinations, instead of the `intTrapDestTable` from OTP-SNMPEA-MIB.
- There are a few new functions in the module `snmp` for trap/notification sending.
- Two new modules are added; `snmp_notification_mib` and `snmp_target_mib`. These modules contain functions for initialising the agent data from configuration files.
- There is a new function `reconfigure/1` in `snmp_standard_mib`, which reconfigures the persistent objects from the configuration files.
- The following mibs are added to the distribution for completeness:
  - SNMPv2-TM
  - SNMPv2-SMI
  - SNMPv2-CONF
  - SNMP-FRAMEWORK-MIB
  - RFC1155-SMI
  - RFC-1212
  - RFC-1215

#### 1.22.2 Reported Fixed Bugs and Malfunctions

- The `snmp_mgr` no longer crashes if an unknown trap is received.
  Own Id: OTP-2137, OTP-2464
- The supervisor of the mibs has a correct shutdown time (infinity instead of 2 secs).
  Own Id: OTP-2310
  Aux Id: seq767, HA79462
- The Mib Compiler now handles the construct MODULE OtherModule in the MODULE-COMPLIANCE macro.
  Own Id: OTP-2465
- The Mib Compiler now handles the construct INTEGER (0..1 | 3..4).
  Own Id: OTP-2466
- The Mib Compiler now handles IMPLIED OIDs
  Own Id: OTP-2467
- The Mib Compiler now handles REFERENCE in the OBJECT-IDENTITY macro.
  Own Id: OTP-2468

#### 1.22.3 Incompatibilities with v2.1.1

- The table `intTrapDestTable` in OTP-SNMPEA-MIB is not used anymore.
- There are three new configuration files; `target_addr.conf`, `target_params.conf` and `notify.conf`. The old file `trap_dest.conf` is not used. However, if a `trap_dest.conf` file exists, the agent automatically converts that file to the new files.
- The function `snmp:send_trap` no longer takes a `CommunityString` as a parameter. This parameter is now optional, and refers to the `snmpNotifyName` in `snmpNotifyTable`. Old code that uses the old function does not have to be changed.
- There are two new messages a `net if` process must handle. These are messages to handle Inform-Requests.

#### 1.22.4 Future Improvements

More MIBs from the so-called SNMPv3 effort will be implemented, as these mibs become standards (although these MIBs don't require SNMPv3). This means that more tables from OTP-SNMPEA-MIB become obsolete, e.g. `intCommunityTable`, `intAddressTable` and `intViewTable`.

SNMPv3 itself will be implemented.

### 1.23 SNMP Development Toolkit v2.1.1

#### 1.23.1 Reported Fixed Bugs and Malfunctions

- The `snmp_note_store` server sometimes didn't invoked its gc, which meant that its internal data structure could grow very large.
  Own Id: OTP-1946, OTP-2004
  Aux Id: seq451
- If a (possibly user-defined) `net if` process crahses and restarts, the agent could crash as well.
  Own Id: OTP-2017
- Failover/takeover of the SNMP agent administering the MIB did not work, since the old implementation tried to delete a Mnesia table on a node which was not up and running (which always is the case at failover). Now the SNMP related Mnesia table is defined to have the `local_content` property.
  Own Id: OTP-2146
  Aux Id: seq1

### 1.24 SNMP Development Toolkit v2.1.1

#### 1.24.1 Reported Fixed Bugs and Malfunctions

- The `snmp_note_store` server sometimes didn't invoked its gc, which meant that its internal data structure could grow very large.
  Own Id: OTP-1946, OTP-2004
  Aux Id: seq451
- If a (possibly user-defined) `net if` process crahses and restarts, the agent could crash as well.
  Own Id: OTP-2017
- Failover/takeover of the SNMP agent administering the MIB did not work, since the old implementation tried to delete a Mnesia table on a node which was not up and running (which always is the case at failover). Now the SNMP related Mnesia table is defined to have the `local_content` property.
  Own Id: OTP-2146
  Aux Id: seq1

### 1.25 SNMP Development Toolkit v2.1

#### 1.25.1 Improvements and new features

- The agent does not use the application `sockets` anymore. Thus, `sockets` does not have to be started before the agent (or manager).
- There are several new functions in the module `snmp` to check the syntax of and convert to/from `DateAndTime` structures.

#### 1.25.2 Reported Fixed Bugs and Malfunctions

- If an `is_set_ok` or `undo` instrumentation function crashed because it called an undefined function, the agent treated this as if the instrumentation function succeeded.
  Own Id: OTP-1762
  Aux Id: seq369
- The function `snmp:date_and_time/0` returns a correct `DateAndTime` structure. Previously, the sign in position 9 was wrong.
  Own Id: OTP-1838
- Traps larger than the maximum packet size are now handled.
  Own Id: OTP-1850
  Aux Id: seq416
- The `snmp_note_store` server never invoked its gc, which meant that its intenal data structure could grow very large.
  Own Id: OTP-1946
  Aux Id: seq451
- Some objects in traps in SNMP v1 MIBs did not get the correct type in the compiled mib. This could lead to that the trap could not be sent.
  Own Id: OTP-2063

### 1.26 SNMP Development Toolkit v2.0

#### 1.26.1 Improvements and new features

- The agent is bilingual, and understands SNMPv1 and SNMPv2c.
- The agent is made multi-threaded (configurable option).
- The agent can be configured to log requests to an Audit Trail Log.
- The application is restructured to be able to restart large parts of the agent in case of an error.
- The NetIf process API is simpler than in previous versions.
- New functions for handling AGENT-CAPABILITES statements in the module `snmp`.
- A few new MIBs are added to the distribution. These are SNMPv2-MIB and SNMPv2-TC. The INTERNAL-MIB has changed its name to OTP-SNMPEA-MIB.
- Added the `coldStart` and `warmStart` traps to the STANDARD-MIB. None of them are sent by default though. The STANDARD-MIB and SNMPv2-MIB defines the same objects and notifications, except for the object specifc to v1 and v2 respectively.
- `snmp:enum_to_int/2` and `snmp:int_to_enum/2` works for types as well as for objects.
- RowStatus no longer needs to be the last column for `snmp_generic` to work. This allows a table to be extended at a later stage.
- A table doesn't need to have all columns defined. Example: `snmp_generic` can handle a table with columns 1,2,3,5.
- `snmp_generic` works even though some columns in the middle of a table are not-accessible.
- Default values for strings may use "" syntax.
- The Mib Compiler understands both SNMPv1 and SNMPv2 MIBs and implements cross-version-IMPORTs.
- The Mib Compiler produces several error messages at the same time.
- The Mib Compiler is more strict.
- `snmp_mgr` can send and receive SNMPv2 messages.
- `snmp:config/0` generates a sys.config file.
- Added a record definition for the Mnesia table `snmp_variables` to `snmp_types.hrl`.
- The master agent may now be a distributed Erlang applications, and it reloads loaded mib during takeover.

#### 1.26.2 Reported Fixed Bugs and Malfunctions

- The Mib Compiler and `snmp_generic` handle objects with STATUS deprecated and obsolete.
  Own Id: OTP-1372
  Aux Id: HA47707
- Agent restarts after crashes keeps information about loaded mibs. Previously, the agent restarted, but all loaded mibs were unloaded.
  Own Id: OTP-1423
  Aux Id: AD84262
- The generated `.hrl` files now starts with an `-ifndef` which makes it possible to include the same file several times.
  Own Id: OTP-1425
- The agent could under som circumstances crash when a table instrumentation function crashed.
  Own Id: OTP-1738
  Aux Id: seq351

#### 1.26.3 Incompatibilities with v1.3.1

- The MIBs must be recompiled.
- The MIB compiler is more strict. Now it also checks that macros are imported correctly.
- The NetIf API is entirely re-written. It is now easier to implement a NetIf process.
- The Proxy handling in `snmp_net_if` is removed.
- The INTERNAL-MIB has changed its name to OTP-SNMPEA-MIB.

#### 1.26.4 Known bugs and problems

The User's Guide now describes where the Agent and MIB compiler don't implement the standard.

### 1.27 SNMP Development Toolkit v1.3.1

#### 1.27.1 Reported Fixed Bugs and Malfunctions

- When trying to create a row that already exists in snmp_local_db, the new row is inserted instead of the old row.

### 1.28 SNMP Development Toolkit v1.3

#### 1.28.1 Improvements and new features

- The MIB compiler has a new "include_lib"-like option called `il`.
  Own Id: OTP-1041
- The `RFC1213-MIB`, `STANDARD-MIB` and `INTERNAL-MIB` are delivered in compiled form (`.bin`) as well as source form. The compiled mibs are located in `snmp-1.2.3/priv/mibs` directory. Use the option `il` to the mib compiler to find these files.
  Own Id: OTP-1272
- A new module `snmp_index` for building snmp indexes like the one used by Mnesia is added.
  Own Id: OTP-1307
- `snmp:mib_to_hrl` generates OBJECT IDENTIFIERs for all internal nodes in a MIB module, not just for the leaves in the tree.
  Own Id: OTP-1319

#### 1.28.2 Reported Fixed Bugs and Malfunctions

- The agent now treats the SNMPv2 error value `wrongValue` correctly.
  Own Id: OTP-1162
- It is now possible to load MIBs with short names.
  Own Id: OTP-1195
- The MIB-compiler now compiles full-path files.
  Own Id: OTP-1217
- The function `snmp:config/0` works for WinNT.
  Own Id: OTP-1216
- The agent handles bad index returned from table instrumentation functions.
  Own Id: OTP-1222
- The data type `IpAddress` works better.
  Own Id: OTP-1234
- The function `snmp:date_and_time/0` now works correctly when called at midnight.
  Own Id: OTP-1236
- The documentation of `snmp_generic:table_set_elements/3` is updated to reflect the fact that it is the caller's responsibility to call this function from within a transaction, if Mnesia is used.
  Own Id: OTP-1265
- The MIB compiler prints the error message "Unexpected 0" when an INTEGER begins with 0.
  Own Id: OTP-1274
- The agent now decodes negative integers correctly.
  Own Id: OTP-1298
- Trying to delete a non-existing row implemented with `snmp_generic` now returns `noError` instead of `inconsistentValue`.
  Own Id: OTP-1331
- Default value initialisation now works for Mnesia tables when `snmp_generic:table_set_row/5` is called.
  Own Id: OTP-1338
- Trying to set a row implemented with `snmp_generic` when an INDEX column was `read-write` got the agent into an infinite loop.
  Own Id: OTP-1342
- `mib_to_hrl` doesn't generate enum definitions for imported `OBJECT-TYPE`s.
  Own Id: OTP-1355
- Traps are not only sent to one manager if several managers are specified as trap destinations, but to all of them.
  Own Id: OTP-1366

### 1.29 SNMP Development Toolkit v1.2.1

#### 1.29.1 Improvements and new features

- The file `STANDARD-MIB.hrl` is now included in the directory `snmp/include`. It may de included in source code with `-include_lib("snmp/include/STANDARD-MIB.hrl").`
  Own Id: OTP-1063
  Aux Id: HA34986, HA36413

#### 1.29.2 Reported Fixed Bugs and Malfunctions

- Calls to the agent had too short timeout. This was most obvious in calls to `snmp:load_mibs/2`.
  Own Id: OTP-1078, OTP-1096
  Aux Id: HA36413
- `snmp:config/0` tried to validate correct IP addresses, resulting in an error when DNS was not used.
  Own Id: OTP-1094
- `snmp:mib_to_hrl/1` generated entries for imported OBJECT IDENTIFIERs and imported DEFVALs, which could result in macro conflict when `.hrl` files from more than one MIB was included.
  Own Id: OTP-1126
- When a row was `createAndWait`ed, it wasn't possible to set a row to `active` in the same request as the rest of the mandatory columns were set.
  Own Id: OTP-1128
- `snmp:int_to_enum/2` crashed when called with an Oid without any enums.
  Own Id: OTP-1129
- The agent could crash if a `RowIndex` in a set-request was of bad type.
  Own Id: OTP-1131

### 1.30 SNMP Development Toolkit v1.2

#### 1.30.1 Improvements and new features

- A new set-phase `undo` is added. When the agent has called `is_set_ok` for an object, it will always call either `set` or `undo` at a later stage. This may be used to reserve resources in the `is_set_ok` function.
- More documentation on Mnesia.
- Added conversion functions from OBJECT IDENTIFIER to symbolic name, and vice versa. These are called `snmp:oid_to_name/1` and `snmp:name_to_oid/1`.
- Added conversion functions from enumerated integers to symbolic value, and vice versa. These are called `snmp:int_to_enum/2` and `snmp:enum_to_int/2`.
- Added an extra parameter from the (configurable) Net If process for each SNMP packet. This value can be retrieved by `snmp:current_net_if_data/0` from an instrumentation function.
- Added a function `snmp:date_and_time/0`, which returns a DateAndTime value, according to RFC1903.
- A new function `snmp:str_apply/1` may be used to pass options to the Mib Compiler from the unix command line.
- There is now no need to have a RowStatus column for a read-only table that is implemented with `snmp_generic`.
- A Mnesia table that implements an SNMP table with `snmp_generic` may have more columns than the SNMP table.
- Added a function `snmp:get/2` to retrieve values from the agent from programs.
- The `snmp:config/0` tool handles host names as strings better.
- The Mib Compiler generates better warnings.
- The agent handles atoms as return values from enumerated integers better.

#### 1.30.2 Reported Fixed Bugs and Malfunctions

- DEFVALs for strings are handled correctly by the Mib Compiler.
- The SNMPv2 error code `notWritable` is translated to the SNMPv1 code `noSuchName`.
- The instrumentation function `delete` is now called correctly when unloading a Mib.
- An `is_set_ok` function is added for `snmp_generic:variable_func`.
- `snmp:mib_to_hrl` doesn't generate output for imported MIB objects.
- The SNMP type `IpAddress` is now BER encoded correctly.
- The agent could hang when last object in the MIB was `not-accessible`, and a GET-NEXT request was received.
- The Mib Compiler doesn't crash when the MIB file doesn't exist.
- The Mib Compiler doesn't crash when an instrumentation function is specified for a column object in a table.

#### 1.30.3 Incompatibilities with v1.1

- The MIBs must be recompiled.
- The contents of the output file from `snmp:mib_to_hrl` has changed. Imported objects are not included. All MIBs with imported objects must be run through `snmp:mib_to_hrl`, and included in the Erlang code as well.
- The start functions for the agent has changed. Note that this is invisible when Erlang 4.4 is used.

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