Code here

Module was bought here Progress (Ukraine)

Development: Release:

You can assemble it itself by

ESP8266 Serial Wi-Fi ESP-01 Adapter+Esp-01 Transceiver or WeMos D1 Mini Pro 16MB

and Industrial TTL To RS485 Module or TTL To RS485 Adapter

ESP8266: RS-485:

Connections:

• Serial port ESP8266 (Tx - IO1, Rx - IO3) - to TTL/RS-485 convertor
• Serial1 port ESP8266 - debug port
• LED1 - GPIO12 ESP8266
• LED2 - GPIO14 ESP8266
• Programming switch - on programming pin ESP8266