Create a client program to interact with a wifi router using SNMP

I need a simple client program (built in C or Java and running on Linux) that will interact with a wireless router using the SNMP protocol (unless you have a better solution). The task is pretty simple: the client needs to set an event-listener on the router, which will monitor for new wireless connections. Whenever a new mobile device connects to the router the event will be captured, and the router will send a message to the client saying a new device connected, along with its MAC address (so called TRAPS in the SNMP protocol). If possible I would also like to have a method on the client that sends a message to the router asking for a list of all the connected devices (i.e., like a DHCP table), and in returns gets a list with the MAC addresses of those devices.