ESP8266: Continuous Delivery Pipeline – Push To Production

The integration of the ESP8266 framework into the Arduino IDE brought ease of use for development. This was further improved when firmwares could be pushed over the local network to the test devices with the direct over-the-air feature. But what if your ESP8266 devices are no longer in your own network? How can you then update all the devices which are running an older version of your firmware? .....