Update gps_client.py add if session valid

gps_client.py

@@ -27,9 +27,9 @@ try:
     while (session.read() == 0) and ((time.perf_counter() - start) < 2) and (mode < 3):
 #        print(gps.MODE_SET)
  #       print(session.valid)
-        if not (gps.MODE_SET & session.valid):
+        if (session.valid):
             # not useful, probably not a TPV message
-            continue
+#            continue
 
 #        print('Mode: %s(%d) Time: ' %
 #              (("Invalid", "NO_FIX", "2D", "3D")[session.fix.mode],