We’ve seen this done with ESP8266 before – repurposing an ESP8089 driver from sources found online, making an ESP8266 into a $2 WiFi adapter for ... you can even get BT audio over I2S.

Web application to read Renogy RS232 compatible BT-1 bluetooth adapter. Compatible with Rover / Wanderer / Adventurer series charge controllers. This client does not need a server and works completely ...