refactor(toString method): Add RSSI / serviceData (espressif#7561)

* refactor(toString method):  Add RSSI / serviceData

These are key characteristics of the BLE advertising packet. Really useful, adding to this method allows data to be easily obtained and passed over TCP/IP for processing.

* fix: remove line 565 bug

Author: RobertByrnes

Diff for: libraries/BLE/src/BLEAdvertisedDevice.cpp

@@ -560,6 +560,17 @@ std::string BLEAdvertisedDevice::toString() {
 		res += ", txPower: ";
 		res += val;
 	}
+	if (haveRSSI()) {
+	       char val[4];
+	       snprintf(val, sizeof(val), "%i", getRSSI());
+	       res += ", rssi: ";
+	       res += val;
+	 }
+	if (haveServiceData()) {
+		for (int i=0; i <getServiceDataCount(); i++) {
+			res += ", serviceData: " + getServiceData(i);
+		}
+	}
 	return res;
 } // toString