An esp-idf component for the Homie convention.

This is alpha-level software. Pull requests are welcome! Here is where we're at:

• Conforms to 2.0.1 of the Homie specification
• Publishes stats for wifi signal, freeheap, and uptime
• OTA firmware updates
• Support for extendible nodes/stats

I believe a minimalist library is a better fit for the ESP-IDF ecosystem rather than a framework. I don't plan to include a captive portal, nor an inversion of program control. The scope of this library will be to manage the MQTT connection using the Homie convention, handle OTA, and little else.

• ESP IDF 3.2.0
• https://github.com/tuanpmt/espmqtt

Clone this component to ESP-IDF project (as submodule):

git submodule add https://github.com/craftmetrics/esp32-homie.git components/esp32-homie

https://github.com/craftmetrics/esp32-homie-example

OTA works according to the following scheme:

1. OTA must be enabled in the config passed to homie_init (it's off by default)
2. The initiating entity publishes a message to ./$implementation/ota/url containing a URL to the new firmware
3. If an error is encountered, the device publishes a message to ./$implementation/ota/status
4. If it is successful, the device reboots into the new firmware

When remote logging is enabled, all calls to ESP_LOG*() are published to ./log.

To enable remote logging, send true to ./$implementation/logging. To disable, send false.

Note that the default logger uses ANSI terminal colors in its log output, you may want to set CONFIG_LOG_COLORS=n in sdkconfig to disable this.