• TRADFRI wireless dimmer IKEA ICTC-G-1
• Firmware build date 20170612
• Firmware version 1.2.248

{“installed_version”:304383346,“latest_version”:587367985,“state”:“available”},“update_available”:true}'

• It sends only action brightness_move_up brightness_move_down messages, so enabling Simulated brightness in Zigbee2MQTT is needed
• Additionally it detects very fast movenents and translate it to on/off actions, sending brightness: 0 or ''brightness: 255' messages
• When brightness is 0 or 255 it floods with message with the same brightness (probably to guarantee that every bulb receives information ?)