Small MQTT node for controlling a Sinilink / XinYi amplifier via Bluetooth (switch between Aux and Bluetooth input, set volume).
Intended for running on a ESP32, using my MQTT node "framework" (https://github.com/rasmus-n/MyNode).
XinYi Sini Audio XY-C50L: https://www.aliexpress.com/item/1005003100996665.html