[3.4.0b7] M957 doesn't seem to work on Duet 2

[OwenD]

I was going to use M957 to help debug some macros, but the examples given all seem to return an error.
Is it supposed to work on Duet 2 WiFi, or only on Duet3 with CAN?

Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.4.0beta7 (2021-12-16)
Duet WiFi Server Version: 1.26
Duet Web Control 3.4.0-b7

[dc42]

@owend the event name in 3.4b7 is "heater_fault" not "heaterFault". It will be "heater-fault" in the next 3.4RC.

[OwenD]

@dc42
Gotcha.
I guess the documentation does say 3.4
https://duet3d.dozuki.com/Wiki/M957
I took that to include betas.

[OwenD]

@dc42
Actually, the documentation doesn't conform to either syntax you have given.