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Let the fun begin.
Fresh from the post box. CC2231 flashed with coordinator software (at least that's what I ordered) so that I should now be able to connect to Zigbee HW from MQTT (and in turn from Node-Red) via the zigbee2mqtt bridge.
As I guess an appetizer in my order of the CC2531 they included this little beauty, a capacitive touch switch. This is really useful for potentially many Arduino/ESP8266 projects. Often better suited than a mechanical switch.
Here's a link from some random seller.
https://hobbycomponents.com/sensors/901-ttp223-capacitive-touch-sensor