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Python HTTP OTA Server

Xavier MULLER edited this page Dec 18, 2018 · 4 revisions


Sonoff-Tasmota firmware can be ugraded using 'Firmware Upgrade' option on main menu and selecting an OTA URL to fetch (and flash) a new firmware on the device.

To use this nice feature users need to deploy an HTTP server with Apache, Nginx or other software solutions switching to superuser privileges and installing additional packages (and libraries) on his own Linux/Windows box.

Python makes available Flask (micro)framework ( that can be used at different levels of complexity due to its modular architecture. A simple HTTP server (hello-world) can be developed only by six lines of Python code (

A Flask application to offer Sonoff-Tasmota firmware images for OTA upgrades is available in 'tools' directory (


  • Python3 (follow instruction related to your operating system)
  • netifaces and Flask libraries - can be installed by 'pip' package manager:
pip install netifaces flask


Copy Sonoff-Tasmota firmware binary files in 'tools/fw' directory. A set of prebuilt files can be downloaded by Sonoff-Tasmota release page:

Configure your Sonoff-Tasmota device with your fw-server URL:

Firmware Upgrade -> Upgrade by web server:

or use the following commands:

otaurl http://<ip_address>:5000/sonoff-minimal.bin
upgrade 1


To start Python HTTP server:

python -d <net_iface>   (default: eth0)
python -i <ip_address>


python -d wlan0
python -i


On Windows operating system it is advisable to use '-i' option because Windows uses UUID name for network interfaces that are not so easy to type...

Linux server:

If your MQTT broker is hosted on a local server, you may want Tasmota OTA to work the same, as a service. Here is how to achieve this:

  • Copy the python script on the linux server
$ sudo su
# mkdir /srv/tasmota/fw_server/fw
# cd /srv/tasmota/fw_server
# wget
  • Create a new file '/etc/systemd/system/tasmota.service' and copy those lines :
Description=Local OTA server for Tasmota
ExecStart=/usr/bin/python /srv/tasmota/fw_server/ -d wlan0
  • User rights

We have created those files and directories as root but it is not desirable, the option User=XYZ should be uncommented and XYZ replaced by you usernane.

In the following commands too, replace 4 time XYZ by your username :

# chown -hR XYZ:XYZ /srv/tasmota
# chown XYZ:XYZ /etc/systemd/system/tasmota.service
  • Run the service
# systemctl daemon-reload
# systemctl enable tasmota.service
# systemctl start tasmota.service
  • Check the service is active and runnning.
# systemctl status tasmota.service
  • Test of the server

To feed the server, we're now able to copy new firmwares in the folder /srv/tasmota/fw_server/fw with XYZ user rights. It can be done with scp or samba for instance. Let's upload firmware.bin into the folder, the service can be tested from any browser by issuing the address http://<ip_address>:5000/firmware.bin were <ip_address> is the adress of the linux server. If you reboot the server, the service should startup again.

Now if you want PlatformIO to be able to upload your compiled binaries to the local server, you'll still have to setup ssh with ssh-keygen in order to use the Tasmota script pio/ without password.

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