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OID values are retrieved by an SNMP client without script interaction, and setting these values simply generates an event from roSnmpAgent stating that it has . Setting OID values will generate an roSnmpEvent object stating that they have been changed. The script event handler can then retrieve new values and take appropriate action.
Setting an OID value from an SNMP client doesn't block the client waiting on any script action; there is a short, but indeterminate, time delay for scripts to act on a value change. This isn't a problem generally because of the way SNMP MIBs are designed. If you want to provide constantly updating OID values, you can update them using either a timer or state changes.
ifSnmpAgent
AddOidHandler(
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oid_string As String,
...
writable_flag As Boolean,
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initial_value As Object) As Boolean
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Adds an OID handler with the following parameters to the SNMP agent:
oid_string: The OID string (e.g. "1.3.6.1.4.1.26095.1.1.1.4.4.0"). All OID strings should be numerical.writable_flag: A Boolean value indicating whether the value can be changed by an SNMP client.initial_value: The initial value, which can be either an roString or roInt. The OID will reflect the type chosen here.
GetOidValue(oid_string As String) As Object
...
Returns the current value (as either roString or roInt) for a given OID.
SetOidValue(
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oid_string As String,
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new_value As Object) As Boolean
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Changes the current value for a given OID. The passed value can be either an roString or roInt.
Start() As Boolean
Starts the SNMP agent. Call this method once all OID handlers have been registered.
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agent = CreateObject("roSnmpAgent")
agent.AddOidHandler("1.3.6.1.4.1.26095.1.1.1.4.4.0", false, "ValueOfOid")
agent.AddOidHandler("1.3.6.1.4.1.26095.1.1.1.4.5.0", true, 10)
agent.Start() |
ifUserData
SetUserData(user_data As Object)
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Returns the user data that has previously been set via SetUserData(). It will return Invalid if no data has been set.
ifMessagePort
SetPort(
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port As
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ifGetMessagePort
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roMessagePort)
Posts messages of type roSnmpEvent to the attached message port.