This error is returned by several API functions to show that the actual communication channel is NOT available.
Without the ready signal of a communication channel it is not possible to communicate with such a channel, because the firmware does not work.
This could also happen after a channel reset, if the communication channel firmware does not startup correctly or hang.
Following Reasons may apply:
- No firmware containing a communication channel is loaded and starten on the hardware (e.g. 2nd Stage Loader is running)
- Internal hardware error, resource problem or a deadlog situation inside the protocol stack firmware
- Wrong parameters or invalid configuration information inside the firmware