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problem with tcp_check_send

I have an application that running TCPIP stack. After random period of time (can be as short as 30 seconds, can be as long as 5 hours) application stops sending data. Data is send/received periodically every 1 second - short data 5 to 7 bytes.

I have traced it to tcp_check_send call always returning false. That is said call to tcp_get_state made after failure returns TCP_STATE_CONNECT, I would think that indicates no failure.

Anybody had this or similar problem? Any pointers?

Thank you
Mike