Tacked in some maintains to hopefully reduce missed URC's

src/TinyGsmClientMC60.h

@@ -721,7 +721,9 @@ protected:
 
     // streamSkipUntil(','); // Skip mux
     // return stream.readStringUntil('\n').toInt();
-    return 1;
+
+    maintain();  // look for a very quick response from the remote
+    return len;  // TODO
   }
 
   size_t modemRead(size_t size, uint8_t mux) {
@@ -739,6 +741,7 @@ protected:
     }
     waitResponse();
     DBG("### READ:", len, "from", mux);
+    maintain();  // Listen for a close or other URC
     return len;
   }
 
@@ -755,6 +758,7 @@ protected:
     if (!result) {
       sockets[mux]->sock_connected = modemGetConnected(mux);
     }
+    maintain();  // Listen for a close or other URC
     return result;
   }
 
@@ -773,6 +777,7 @@ protected:
     int res = stream.readStringUntil(',').toInt(); // socket state
 
     waitResponse();
+    maintain();  // Listen for a close or other URC
 
     // 0 Initial, 1 Opening, 2 Connected, 3 Listening, 4 Closing
     return 2 == res;