Send zframe to UDP socket, return -1 if sending failed due to
interface having disappeared (happens easily with WiFi)
*** This is for CZMQ internal use only and may change arbitrarily ***

def udp_send(udpsock, frame, address, addrlen):
        """
        Send zframe to UDP socket, return -1 if sending failed due to
interface having disappeared (happens easily with WiFi)
*** This is for CZMQ internal use only and may change arbitrarily ***
        """
        return lib.zsys_udp_send(udpsock, frame, address, addrlen)