I'm controlling three old FTXSxxG splits
- esp8266mini
- mini560 step down (5V output version)
- mini breadboard
- 4 dupont cables male-female
this is a platformio project.
On my units the S21 port is:
1 - Seems unused
2 - TX (5V)
3 - RX (5V)
4 - VCC (14.5V)
5 - GND
Luckily, RX port accepts 3.3V levels so i did not need a level shifter.
I used D6 and D7 as serial port pins for the ESP8266.
Well, this also fits inside the units, seems good!
i did not want to use already available code since this is not fun enough, so i just wrote my code.
- I kept a functional bootstrap-based web interface
- i decided to keep the hardware serial functional for debugging, so i moved the control on a software serial
- i included remotedebug library https://github.com/JoaoLopesF/RemoteDebug (please check the fixes!) to be able to debug the functioning also remotely
- ota update available
- all data exchange is json-ed: via websocket, via http call and via mqtt
- commands are accepted (and data is published) in the web interface, via http call and via mqtt, same format is used.
- since the starting point was the home assistant integration, this was achieved with https://www.home-assistant.io/integrations/climate.mqtt/ . For a couple of "limits" of the integration (power and swing management), the code implements a couple of custom calls.
- wifi manager for wifi config
As said, the integration is done through MQTT, so i also added an example of code for integration and with templates. You'll probably need to redefine lists and for sure mqtt topics.
Remotedebug library has some flows, please remember to:
- modify the RemoteDebugCfg.h file, line 104, to disable websockets (or it's gonna conflict with the asyncwebserver websockets server)
#define WEBSOCKET_DISABLED true
- comment out the part of the WebSocketsClient.cpp file between lines 700 and 710, since you are not using it but it gives exceptions with recent ESP8266 core.
/*#if (WEBSOCKETS_NETWORK_TYPE == NETWORK_ESP8266)
_client.tcp->setNoDelay(true);
if(_client.isSSL && _fingerprint.length()) {
if(!_client.ssl->verify(_fingerprint.c_str(), _host.c_str())) {
DEBUG_WEBSOCKETS("[WS-Client] certificate mismatch\n");
WebSockets::clientDisconnect(&_client, 1000);
return;
}
}
#endif */
i did not even know about the S21 socket, so i NEED to thank:
https://github.com/joshbenner/esphome-daikin-s21/tree/main
https://github.com/revk/ESP32-Faikin
As you'll see, i also took pieces of code, but i wasn't fully happy about it's structure, so i rewrote it as a states-machine to reduce blocking in code.
i am NOT a programmer :) but i understand a lot of parts could be better written, and that some things could be done with higher security and bla bla bla.
I would not (and i don't) expose the controller on internet, this should clarify what i mean :)
someone asked, so why not?
Since i'm not a programmer and i'm totally lost in git, please don't hesitate reporting any ANY issue in my code or anything wrong you see :)