fix channel num in json output

src/mesh/http/ContentHandler.cpp

@@ -645,7 +645,7 @@ void handleReport(HTTPRequest *req, HTTPResponse *res)
     // data->radio
     JSONObject jsonObjRadio;
     jsonObjRadio["frequency"] = new JSONValue(RadioLibInterface::instance->getFreq());
-    jsonObjRadio["lora_channel"] = new JSONValue((int)RadioLibInterface::instance->getChannelNum());
+    jsonObjRadio["lora_channel"] = new JSONValue((int)RadioLibInterface::instance->getChannelNum() + 1);
 
     // collect data to inner data object
     JSONObject jsonObjInner;