It took some hours, mainly because I am kind of new with a lot of this
I connected the arduino (with voltage divider!) direct to TXD and RXD on the wisnode. After some probing, i found that commands are passed from the wisnode USB to these ports, so communication should work.
Still no answer.
The main problem was this: Arduino Serial.write does not write a carriage return.
When the wisnode does not receive a carriage return, it does not execute the command.
add this line on top of the SoftwareSerialExample i linked in my previous post:
change the bottom few lines so it is as follows:
If i bodged this together correctly (i haven't tested it extensively ) it should check for the end of the text, and replace it with \r\n, also it adds a local echo of your command.
It will start with Error -1 because 'carriageCheck' is still empty, but after that no problems.