String sent to serial out

[Hermann]

Just out of curiosity: What is the difference between a string in the payload of an inject node and the string in the payload of a function node?

I am trying to send a string like "aaax\n" from an inject node directly to a serial out node to be read by an Arduino. The string is sent, the Arduino reads the serial output correctly (the "x" indicates the end of the message for the Arduino) but the serial buffer of the Rasberry Pi is not emptied because the \n is not recognized.
If I send the string "aaax" from the inject node to a function node first and attach the \n there (msg.payload = msg.payload + "\n") everything works as expected.

[Dave C-J]

That is the difference.... :-)

On the inject node the input field is read, and the \n is automatically escaped to be \\n internally... And that then appears as \n on the arduino...  Doing it inside the function doesn't escape the \ so it then sends the "\n" character.

[Hermann]

Thanks for the information Dave. ;-)

It took me a couple of days to find that out. Maybe there should be a remark in the documentation that escape sequences do not work in inject nodes...

[Dave C-J]

Good point...