provide a socket timeout parameter so apps don't get hung up in socket.recv

pywsjtx/extra/simple_server.py

@@ -47,8 +47,12 @@ class SimpleServer(object):
         self.sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
 
     def rx_packet(self):
-        pkt, addr_port = self.sock.recvfrom(self.MAX_BUFFER_SIZE)  # buffer size is 1024 bytes
-        return(pkt, addr_port)
+        try:
+            pkt, addr_port = self.sock.recvfrom(self.MAX_BUFFER_SIZE)  # buffer size is 1024 bytes
+            return(pkt, addr_port)
+        except socket.timeout:
+            logging.debug("rx_packet: socket.timeout")
+            return (None, None)
 
     def send_packet(self, addr_port, pkt):
         bytes_sent = self.sock.sendto(pkt,addr_port)

samples/dump_wsjtx_packets.py

@@ -6,6 +6,7 @@ import pywsjtx.extra.simple_server
 s = pywsjtx.extra.simple_server.SimpleServer('127.0.0.1','2237',timeout=2.0)
 
 while True:
+
     (pkt, addr_port) = s.rx_packet()
     if (pkt != None):
         the_packet = pywsjtx.WSJTXPacketClassFactory.from_udp_packet(addr_port, pkt)