I have reflashed the Sonoff Zigbee bridge with the Tasmota firmware.
The device has the right LED lit (dim blue).
If I press the pairing button adjacent to the power, the blue LED goes out and the left LED goes on (bright green).
Connecting to the console, I can see that this is changing the power state of the device from ON to OFF.
However, it seems to have no impact on functionality - I can pair and receive events from devices in either state.
What do the two states do, and which state should the device be in for normal use?