increase watchdog timer to 10s since the device/USB stack sometimes needs longer

u2_usb.c

@@ -133,7 +133,7 @@ int main(int argc, char* argv[])
 	}
 
 	signal(SIGALRM, watchdog); // setup watchdog
-	alarm(5); // start watchdog (in case connecting to the U2 gets stuck)
+	alarm(10); // start watchdog (in case connecting to the U2 gets stuck)
 
 	// UDP socket to send data to influxdb
 	int influxdb_fd = 0;
@@ -217,7 +217,7 @@ int main(int argc, char* argv[])
 			continue;
 		}
 
-		alarm(5); // restart watchdog
+		alarm(10); // restart watchdog
 
 		// parse measurement values
 		meas.seconds = meas.payload[2];