DHT22 reading - Continuus Delivery with OTA

If you are using OTA and you want to use Deep sleep - you will come to the point where you are not able to upload your new firmware just because device is sleeping.

Here is a nice and clever way to make your device ask for update when it wakes up from deep sleep.

Continuus Delivery with OTA

1. The build is tagged with a version number using PlatformIO build-flag

2. A web server with an intermediate PHP script loads version.json file to check the latest release version and returns this as a string.

3. ESP sends it’s current running firmware version to the PHP script using
   tag argument &tag=0.0.1

4. If the running firmware version does not match the latest release version, the PHP script grabs the latest release firmware.bin from the same web server and serves it up as a download to the ESP.

5. ESP then flashes the compiled firmware.bin OTA update using the ESP8266httpUpdate library which is built-in to the espressif Arduino tool-chain

How to upload new firmware?

firmware.bin is located .pioenvs / board folder. In my case it is .pioenvs /d1_mini folder

Just copy the firmware.bin to the web server folder then update the file version.json with editor changing "tag_name": "0.0.1", for example to "tag_name": "0.0.2", Then on next wake up device will see that it needs to update its firmware.

Thanks to :

• Squix TechBlog

and

• OpenEnergyMonitor