Stream data from node-red to c program?

@Colin I tried this, but still I get the error

error

[{"id":"88d894d0.d2b9e8","type":"inject","z":"2998129e.ad50de","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"-v -a3 -c1 -f434 -m100","payloadType":"str","x":180,"y":320,"wires":[["454465f3.2b008c"]]}]

@Colin, This my intended command : sudo ./RX_Demo -v -a3 -c1 -f434 -m100

@sridhar2rok: I just entered the absolute path to my C program in the Command field, e.g.:

C:/Users/JDoe/SomeFolder/CompiledCProgram.exe

But getting the program to execute was only a fraction of the challenge for me. Most of my time was spent figuring out how to get the input data in just the right format for the program. That took a bit of experimenting and a lot of staring at debugger node outputs :smiley:

Note that I said you have to use the full path to the command, not ./command.
Also if you need to use sudo then you will have to tell the system that the node-red user does not need to enter a password to run that command with sudo. Better is to make sure that the node-red user has access to whatever the command needs to access, so you don't need to use sudo.