This function creates an SNMP session for a particular configuration entry, which represents a session with a target agent. Sessions are supported for communication using SNMPv1, SNMPv2c, and SNMPv3. This function opens a socket and returns the handle to the session, which is used as input to the snmpBuildPDU(), snmpBuildV1TrapPDU(), snmpBuildV2TrapOrInformPDU() and snmpSendRequest() functions.