How to read file line by line

[Colin]

@Steve-Mcl

Does the msg contain the contents you sent into the MQTT out node?

Yes, and any node written should, I believe, follow that convention.

[Colin]

@AnusudhanK7

Is there any way that i can check the MQTT connection exist or not before pushing the data to the server.

Yes, using the Status node as Dave suggests, however you must still allow for the fact that there is allways the possibility of the connection failing between checking the status and sending the message to the MQTT node.