Node RED receive message

[John Li]

I’ve connected mDot to my Conduit running NodeRed, and place a debug node to display the “msg.payload”. But I received the payload type to be “buffer”, and the content cannot be displayed. The mbed code I used is the mDot_Sleep_Example on from MultiTech, and I revised the network name, password and subfreq as instructed. Is there anything wrong with my operation?

[Jason Reiss]

If you would like the content to be displayed, the lora-in node has the option to output a UTF-8 string instead of the buffer.

[John Li]

Thanks Jason for your reply. How could I output UTF-8 string in my lora node? This is the code I used, std::vector<uint8_t> data; std::string data_str = “hi”; how can I change the output into UTF-8?

[Jason Reiss]

The output is changed in Node-RED. The “lora-in” node is where packets enter the flow.

You can either change the setting of the lora-in node to UTF-8 in Node-RED or create a function node that converts the payload from a buffer to a string.

msg.payload = msg.payload.toString("utf8");

return msg;

[Author]

Posts