RP2040: MQTT client support for Raspberry Pi Pico W

baz123 · November 24, 2022, 8:27am

If you want MQTT support for the RP2040, please ‘thumbs up’ this feature request

RP2040: MQTT client support for Raspberry Pi Pico W

opened 03:47PM - 17 Nov 22 UTC

integration: mqtt integration: rp2040

**Describe the problem you have/What new integration you would like** I would like to see MQTT client support for ESPHome on the Raspberry Pi Pico W platform. The existing MQTT client only supports the ESP8266 and ESP32 platforms. - https://github.com/OttoWinter/async-mqtt-client Previously, attempts to build ESPHome with MQTT for Raspberry Pi Pico W failed with compilation errors. ``` # file: picodebug.yaml esphome: name: picodebug build_path: /tmp/.esphome rp2040: board: rpipicow framework: platform_version: https://github.com/maxgerhardt/platform-raspberrypi.git logger: api: password: "" ota: password: "" wifi: ssid: !secret wifi_ssid password: !secret wifi_password mqtt: broker: 192.0.2.1 ``` - the JSON component wants a free_heap number but it's hardware specific and only available for ESP8266/ESP32 - the MQTT library similarly only support ESP8266/ESP32 Example: ``` Compiling /tmp/.esphome/.pioenvs/picodebug/src/esphome/components/json/json_util.cpp.o src/esphome/components/json/json_util.cpp: In function 'std::string esphome::json::build_json(const json_build_t&)': src/esphome/components/json/json_util.cpp:29:34: error: 'free_heap' was not declared in this scope 29 | size_t request_size = std::min(free_heap, (size_t) 512); | ^~~~~~ ``` - see https://github.com/esphome/esphome/blob/dev/esphome/components/json/json_util.cpp#L19-L29 ...and: ``` Compiling /tmp/.esphome/.pioenvs/picodebug/src/esphome/components/mqtt/custom_mqtt_device.cpp.o In file included from /tmp/.esphome/.piolibdeps/picodebug/AsyncMqttClient-esphome/src/AsyncMqttClient.h:4, from src/esphome/components/mqtt/mqtt_backend_arduino.h:6, from src/esphome/components/mqtt/mqtt_client.h:15, from src/esphome/components/mqtt/custom_mqtt_device.h:7, from src/esphome/components/mqtt/custom_mqtt_device.cpp:1: /tmp/.esphome/.piolibdeps/picodebug/AsyncMqttClient-esphome/src/AsyncMqttClient.hpp:14:2: error: #error Platform not supported 14 | #error Platform not supported ``` - see https://github.com/OttoWinter/async-mqtt-client/blob/master/src/AsyncMqttClient.hpp#L8-L15 The MQTT component has since been disabled for the RP2040 platform: - https://github.com/esphome/esphome/pull/4025 **Please describe your use case for this integration and alternatives you've tried:** I would like to send sensor data over MQTT for recording outside of Home Assistant (HA) as well as do signalling with other services available only over MQTT. **Additional context** It might be worth considering that there are open discussions on the topic of MQTT clients: - https://github.com/esphome/feature-requests/issues/811 NOTE: Signal your interest in this feature with the "thumbs up" on this post. No need to spam the issue thread with "me too" comments (they cause unnecessary email notifications).