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RL-TCPnet - UDP callback

Hello,

I'm noticing a strange scenario happening on my system while using a UDP socket from the RL-TCPnet library.

Scenario summary:
lpc1788 micro - custom board
RTX in use
1 UDP socket
Webserver running
all TCPnet stuff happens in a single task

The issue is that everything works as in the documentation except that for some reason my udp_callback function is getting called twice for each received packet.

(http://www.keil.com/support/man/docs/rlarm/rlarm_udp_get_socket.htm)

All parameters to the callback are exactly the same on the second call.

All I do in the callback is copy the buffer to another buffer and set a flag.

Has anyone ever seen this, or have any ideas what might be going on?

Thanks.