Added some rules to get the switch working, based on https://tasmota.github.io/docs/Blinds-and-Shutters:
SetOption80 1 # Enable shutter support, reset the device after for correct interface to show up SetOption13 1 # only single press action for immediate response, for faster buttton response ShutterRelay1 1 # Enable shutter relay 1 Backlog PulseTime1 0; PulseTime2 0 # ShutterMode0 Pulsetime3 1 # auto disable Power3 button Backlog Interlock 1,2,3; Interlock ON PowerRetain 1 # Save state for Home Assistant Rule1 on Power3#State=1 do ShutterStop1 endon # Use the middle button for stopping shutter movement Rule1 1 Rule2 on Power1#State=0 do LEDPower1 0 endon on Power1#State=1 do LEDPower1 1 endon on Power2#State=0 do LEDPower2 0 endon on Power2#State=1 do LEDPower2 1 endon on Power3#State=0 do LEDPower3 0 endon on Power3#State=1 do LEDPower3 1 endon # Giving color on button press Rule2 1 WebButton3 ■ # Set stop symbol for the third button in the web GUI SwitchMode1 4 # Make the buttons do their actions on touch, not release SwitchMode2 4 SwitchMode3 4
Do the calibration as per instructions in Tasmota documentation.
Flashing the device using TuyaConvert worked in this case even though multiple devices were manufactured in October 2019. There are no prebuilt Tasmota binaries with native shutter support included, so Tasmota must be compiled manually with the correct flag for this functionality to be present. Instructions for this can also be found in Tasmota documentation.
The shutter can now be integrated into Home Assistant:
cover: platform: mqtt name: "Shutter 1" availability_topic: "tele/<tasmota>/LWT" payload_available: "Online" payload_not_available: "Offline" position_topic: "stat/<tasmota>/SHUTTER1" position_open: 100 position_closed: 0 set_position_topic: 'cmnd/<tasmota>/ShutterPosition1' command_topic: "cmnd/<tasmota>/Backlog" value_template: '' payload_open: "ShutterOpen1" payload_close: "ShutterClose1" payload_stop: "ShutterStop1" retain: false optimistic: false qos: 1