Failure to upload should result in a non-zero return code.

[Willamin]

I frequently see the following error message:

[NodeMCU-Tool] Unable to establish connection - Timeout, no response detected - is NodeMCU online and the Lua interpreter ready ?

Because this error message always results in a 0 return code, I'm unable write a script to automatically retry.

[AndiDittrich]

i'll check this

[AndiDittrich]

i've added different return codes in NodeMCU-Tool v3

• 0 success
• 1 general error
• 127 low level serial communication error

please give it a try :)

[Willamin]

Thanks, @AndiDittrich! It looks good to me.