ESP8266 OTA Firmware Upgrade Manager
This flow provides a tool for managing Over The Air firmware updates for ESP8266 Wifi SoC modules running the Arduino ESP8266 environment. It also supports Sonoff devices running the Tasmota firmware.
The ESP8266 is a very small, cheap, and reasonably powerful microcontroller with integrated WiFi. The OTA firmware upgrade process allows you to install these modules in location and have them automatically upgrade their firmware over WiFi.
The OTA upgrade library contacts a specified URL and passes the name and MD5 hash of the module's current firmware. This server implemented in this flow will compare the supplied MD5 hash against the one for the latest firmware and, if different, send the new firmware to the module. The server will uses either the module's MAC address or firmware name to identify the correct firmware file to send. The firmware can be specified in either the request URL or in the x-esp8266-version property in the request header.
This flow also includes a firmware management screen for uploading new firmware files, deleting firmware files, and creating symbolic links to existing firmware files. Symbolic links allow you to point a specific MAC address to a firmware file so as to be able to replace the firmware on a module with a completely different one.
The firmware manager is accessed from http://your.node-red.server:1880/esp8266-ota
A template for producing firmware with OTA upgrade built in is available from this gist. This template checks for a firmware update on each boot up. It then runs a process such as reading a sensor and publishing the value, before entering a power saving deep sleep. When it wakes, it will check for a firmware upgrade again and repeat the cycle.
The Sonoff TASMOTA firmware is also supported. Set the OTA URL to be the full path of the firmware, ie. http://your.node-red.server:1880/esp8266-ota/update/sonoff.ino.generic
You will need to use version 2.4.1 or greater of the Arduino ESP8266 core.
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