Running XCTU ver 6.3.0 with a pair of 9XTEND modems in API mode.
I can remotely discover and issue AT read commands over the air, but when I attempt to write commands like ATPL1 (via XCTU) to the remote device, I get an error.
The problem is due to hex / binary confusion. XCTU is attempting to issue a remote ATCF command, which is not supported by the 9XTEND DIGIMESH firmware. And then it attempts to issue ATPL<0x31> instead of ATPL<0x01>.
So, why does XCTU think it can issue the unsupported ATCF command?