snmpBuildSession parameters

configEntry: This input parameter specifies the configuration information that is to be used to create this session. The format of the SnmpConfigEntry structure is specified in the snmpmgr.h file. This parameter is typically obtained from the snmpInitialize() call, but alternatively you can manually create an SnmpConfigEntry structure. This parameter is required.
snmpSession: This output parameter is a pointer to the variable where the address of the SnmpSession parameter is stored. This parameter is required.
localAddr: This input parameter specifies the local address and port that are to be used for sending the SNMP message. If this parameter is set to NULL, the TCP/IP stack selects the source address and port.