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--- sonoff [08.12.2018 09:54] – [retention and QoS] Pascal Suter
+++ sonoff [30.11.2020 13:58] – [Falshing Tasmota Firmware] Pascal Suter
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 I personally went for flashing over a USB TTL adapter using the Arduino IDE. It is important to notice, that the TTL adapter needs to provide 3.3V, not 5V! Also i recommend using a PL2303 based USB TTL adapter, as others did not work for me (spent hours trying until I finally gave up and tried with a PL2303 based one I had laying around). Another important Point was, how to enter the programming mode: Hold down the pushbutton while connecting only the power pins. Leave at least one of the two data pins disconnected. Then let go of the button and connect the RX and TX (crossed). Flasing did not work for me when i connected all wires at the same time while holding down the button.
-I strongly recommend to edit the settings before compiling and adding your wifi credentials, this will save some time and hassle when configuring the device later on. It will simply connect to your wifi and you can access its webpage to do the rest of the configuration.
+<del>I strongly recommend to edit the settings before compiling and adding your wifi credentials, this will save some time and hassle when configuring the device later on. It will simply connect to your wifi and you can access its webpage to do the rest of the configuration. </del> **Update**: don't do this! whenever possible, flash the stock ''tasmota.bin'' file, it is alot easier to do so and your sonoff will fall back to a setup mode if the wifi password has changed and it can no longer login.. also with new tools such as Tasmotizer, the credentials can be configured after flashing over the serial connection which makes it much easier than hardcoding and compiling your settings.
 Here are the steps it took to flash the stock sonoff (current and more detailed instructions can be found in the [[https://github.com/arendst/Sonoff-Tasmota/wiki/Arduino-IDE|Tasmota wiki]]
+**Update**: again, the instructions below are obsolete and may only be valid if you want to re-compile tasmota.. but you rarely will have to do that.. Instead i recommend using [[https://github.com/tasmota/tasmotizer|Tasmotizer]], a very simple python gui which can be installed using pip3 on Windows, linux and mac (for widows there is even an exe installer). besides flashing your tasmota compatible device it can also set your wifi settings and subsequently show the ip of the device as long as it is still attached to the serial interface.
+here are the steps using Tasmotizer:
+  * install tasmotizer: <code
+pip3 install --upgrade pip wheel
+pip3 install tasmotizer
+tasmotizer.py</code>
+  * under "Select Image" choose "release" and then select whatever image you want to flash, in most cases this will be ''tasmota.bin''
+  * connect your sonoff to the serial2usb adapter WITH MAINS DISCONNECTED!! hold down the push button and plug-in the usb adapter.
+  * let go of the push button and click "refresh" next to the "Select Port" drop down. most likely this will see and select your usb adapter
+  * click "Tasmotize" and wait for it to erase and reflash your device.
+  * once that is done, unplug your usb adapter and plug it back in, to reset the sonof
+  * now click on send config and enter your desired config, then upload it.
+  * a few seconds later, your sonoff sould be connected to your network and with Get IP you can now see the ip it got from your DHCP.
+If you really want to compile tasmota yourself, you should read the official documentation, as what follows now is already several years old and probably no longer exactly true. however, I wrote it, so here it is anyway :) ..
   - [[setup arduino IDE for ESP8266]]
   - download the sourcecode tar.gz or zip package from the [[https://github.com/arendst/Sonoff-Tasmota/releases|Tasmota releases page]]
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 and here is what it looks like:
 {{ :node-red:flow.png |}}
+==== a word about retention ====
+it seems node-red sets the retention flag of mqtt by default. I learned this when i used it together with the mqtt-dss-connector: i created a rule that turned the light in the bathroom on. if i turned it off later (not via node-red) and then restarted the mqtt-dss-bridge the light in my bathroom went on again "for no reason" .. this was because that on command was published with the retention flag set to on (or actually not set to anything in node-red). so i set it to "false" and the problem was resolved.
 ===== Making the installation permanent =====
 this might be different in your setup, but I would like to install the npm modules globally and then run them as non-root users through a systemd script to make sure they are auto-startet as soon as my system boots.