netbuf_fromport() — Obtain the sender's port number for a netbuf


u16_t netbuf_fromport (struct netbuf *buf );


Returns the port number of the host the netbuf buf was received from. If the netbuf has not been received from the network, the return value of this function is undefined. The function netbuf_fromaddr() can be used to obtain the IP address of the remote host.