I did not find a similar project, so I started hacking away and got it working (finally). Sharing the code with anybody who cares. If you have suggestions, please let me know :).
Setup: RPi3 with Openhabian, Node-Red, cr2531USB dongle, SONOS Play 1 and IKEA Tradfri Remote.
Requirements:
Button left & right: Change Radiostation (Streaming)
Button up & down: Change Volume
Center Button: Un-/Mute
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\nflow.set('radioStationIndex',radioStationIndex);\n//return msg.payload;\n\nvar newMsg = { payload: radioStationIndex };\nreturn newMsg;","outputs":1,"noerr":0,"x":410,"y":200,"wires":[["e726ab74.46f2f8"]]},{"id":"73c981db.9fe68","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"group.play","state":"on","stateType":"str","name":"Group Play","x":1030,"y":180,"wires":[["e3a63deb.6e22f"]]},{"id":"e3a63deb.6e22f","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"player.set.mutestate","state":"off","stateType":"str","name":"Mute OFF","x":1200,"y":180,"wires":[[]]},{"id":"a69a89ef.747518","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"player.set.mutestate","state":"off","stateType":"str","name":"Mute OFF","x":1200,"y":240,"wires":[[]]},{"id":"123e1910.4f2fc7","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"group.play","state":"on","stateType":"str","name":"Group Play","x":1030,"y":240,"wires":[["a69a89ef.747518"]]},{"id":"3e981515.3b272a","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"player.set.mutestate","state":"off","stateType":"str","name":"Mute OFF","x":1200,"y":300,"wires":[[]]},{"id":"1f0e05b.ac034fa","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"group.play","state":"on","stateType":"str","name":"Group Play","x":1030,"y":300,"wires":[["3e981515.3b272a"]]},{"id":"c3f6edf9.78171","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"player.set.mutestate","state":"off","stateType":"str","name":"Mute OFF","x":1200,"y":360,"wires":[[]]},{"id":"d1862827.2f0338","type":"sonos-universal","z":"48ec5f34.b0f0f","confignode":"25ad6a24.132e56","compatibilityMode":false,"command":"group.play","state":"on","stateType":"str","name":"Group Play","x":1030,"y":360,"wires":[["c3f6edf9.78171"]]},{"id":"14016201.7769ae","type":"zigbee2mqtt-server","z":"","name":"thebrain","host":"thebrain.local","mqtt_port":"1883","mqtt_username":"openhabian","mqtt_password":"geheim99","base_topic":"zigbee2mqtt"},{"id":"723d00ae.be99a","type":"better-sonos-config","z":"","name":"Wohnzimmer","serialnum":"B8-E9-37-5A-C1-5E:7","ipaddress":""},{"id":"25ad6a24.132e56","type":"sonos-config","z":"","name":"Wohnzimmer Play1","ipaddress":"192.168.1.152","port":""}]
