ESPHome vs OpenMQTTGateway for ESP32 Bridges

Do not choose ESPHome or OpenMQTTGateway by comparing feature lists first. Start by defining the ESP32 operating model.

Use ESPHome when the ESP32 is a device node:

• sensors
• relays
• GPIO devices
• RS485 or UART nodes
• Home Assistant entities
• OTA-maintainable configuration

Use OpenMQTTGateway when the ESP32 is a protocol collection gateway:

• BLE advertisements
• 433 MHz remotes
• IR events
• passive external signals
• MQTT topic publication

Implementation checklist:

1. Define whether the ESP32 is one controllable device or a signal collector.
2. For a device node, model hardware entities clearly in ESPHome.
3. For a signal collector, define MQTT topics, payloads, and device identifiers before deployment.
4. Avoid combining relay control, sensor entities, BLE collection, RF decoding, and IR handling in one maintenance model unless there is a clear reason.
5. Test the debugging path: entity logs for ESPHome, topic and payload inspection for OpenMQTTGateway.

The main edge case is a hybrid bridge. If the same ESP32 controls local hardware and also listens to many external signals, split responsibilities where possible. If splitting is not possible, document which part owns state, which part owns MQTT topics, and how failures will be diagnosed.

Source:
https://zediot.com/blog/esp32-openmqttgateway-vs-esphome-for-bridges/