If the functionality with Crestron/AMX etc. controllers does not work well the best way to narrow the area of problem is using Emulator. If Emulator works fine the reason somewhere in controller programming, not in Polywall.
In PuTTY do not use /x0D in the end. just type the command!
For example for playing scenario with name "1".
xCommand Scenarios Scenario "1" Play
Emulator and the list with Polywall API commands are attached below.