Trouble controlling Sonoff with MQTT switch

I’ve answered my own question. I asked why my Sonoff device was not being controlled correctly by a Home Assistant MQTT switch using multi-level identification, for example:


I found this thread on Google Groups which suggests the Sonoff-Tasmota firmware does not allow for multi-level identification of MQTT clients and instead requires each Sonoff device to be identified by a unique name (e.g. cmnd/kitchen_worktop_lights/POWER).


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