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# snmpa_network_interface behaviour (snmp v5.20.2)

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Behaviour module for the SNMP agent network interface.

This module defines the behaviour of the agent network interface. A `snmpa_network_interface` compliant module must export the following functions:

- `start_link/4`
- `info/1`
- `get_log_type/1`
- `set_log_type/2`
- `verbosity/2`

The semantics of them and their exact signatures are explained below.

But this is not enough. There is also a set of mandatory messages which the network interface entity must be able to receive and be able to send. This is described in chapter snmp_agent_netif.

## Summary

### Callbacks

get_log_type(Pid)

The Audit Trail Log is managed by the network interface process. So, it is this process that has to retrieve the actual log-type.

get_request_limit(Pid)

The request limit is the number of simultaneous requests the agent will accept. This function retrieve the current value.

info(Pid)

The info returned is basically up to the implementer to decide. This implementation provided by the application provides info about memory allocation and various socket information.

set_log_type(Pid, NewType)

The Audit Trail Log is managed by the network interface process. So, it is this process that has to do the actual changing of the type.

set_request_limit(Pid, NewLimit)

The request limit is the number of simultaneous requests the agent will accept. This function sets a new value.

start_link(Prio, NoteStore, MasterAgent, Opts)

Start-link the network interface process.

verbosity(Pid, Verbosity)

Change the verbosity of a running network interface process.

## Callbacks

# get_log_type(Pid)

    -callback get_log_type(Pid) -> {ok, LogType} | {error, Reason}
                              when Pid :: pid(), LogType :: snmp:atl_type(), Reason :: term().

The Audit Trail Log is managed by the network interface process. So, it is this process that has to retrieve the actual log-type.

# get_request_limit(Pid)

(since OTP 27.0)

    -callback get_request_limit(Pid) -> {ok, Limit} when Pid :: pid(), Limit :: non_neg_integer() | infinity.

The request limit is the number of simultaneous requests the agent will accept. This function retrieve the current value.

# info(Pid)

    -callback info(Pid) -> Info when Pid :: pid(), Info :: [{Key, Value}], Key :: term(), Value :: term().

The info returned is basically up to the implementer to decide. This implementation provided by the application provides info about memory allocation and various socket information.

The info returned by this function is returned together with other info collected by the agent when the `info/1` function is called (tagged with with the key `net_if`).

# set_log_type(Pid, NewType)

    -callback set_log_type(Pid, NewType) -> {ok, OldType} | {error, Reason}
                              when
                                  Pid :: pid(),
                                  NewType :: snmp:atl_type(),
                                  OldType :: snmp:atl_type(),
                                  Reason :: term().

The Audit Trail Log is managed by the network interface process. So, it is this process that has to do the actual changing of the type.

See `snmpa:set_log_type/2` for more info.

# set_request_limit(Pid, NewLimit)

(since OTP 27.0)

    -callback set_request_limit(Pid, NewLimit) -> {ok, OldLimit}
                                   when
                                       Pid :: pid(),
                                       NewLimit :: non_neg_integer() | infinity,
                                       OldLimit :: non_neg_integer() | infinity.

The request limit is the number of simultaneous requests the agent will accept. This function sets a new value.

# start_link(Prio, NoteStore, MasterAgent, Opts)

    -callback start_link(Prio, NoteStore, MasterAgent, Opts) -> {ok, Pid} | {error, Reason}
                            when
                                Prio :: low | normal | high,
                                NoteStore :: pid(),
                                MasterAgent :: pid(),
                                Opts :: [Option],
                                Option :: {verbosity, snmp:verbosity()} | {versions, [snmp:version()]} | term(),
                                Pid :: pid(),
                                Reason :: term().

Start-link the network interface process.

`NoteStore` is the pid of the note-store process and `MasterAgent` is the pid of the master-agent process.

`Opts` is an (basically) implementation dependent list of options to the network interface process. There are however a number of options which must be handled: `versions` and `verbosity`.

# verbosity(Pid, Verbosity)

    -callback verbosity(Pid, Verbosity) -> snmp:void() when Pid :: pid(), Verbosity :: snmp:verbosity().

Change the verbosity of a running network interface process.