Add support for XL9535 relay board

[mahnunchik]

Is your feature request related to a problem? Please describe.

It would be nice if mqtt-io supports XL9535 relay board.

Describe the solution you'd like

Normal integration like other I2C PCF8574 or PCF8575 gpio expanders.

Describe alternatives you've considered

Write the code...

Additional context

I bought a great relay board, with 16 relays, which is enough for all my needs. I would like to have simple and convenient integration.

More info:

• Python module and description https://github.com/mcauser/micropython-xl9535-kxv5-relay
• Datasheet https://www.lcsc.com/datasheet/lcsc_datasheet_2211110930_XINLUDA-XL9535_C561273.pdf
• ESPHome integration https://github.com/esphome/esphome/tree/857a3dcf72d74fa53fba2f6c63f2ceaaec3e5e59/esphome/components/xl9535
• Discussion on micropython https://github.com/orgs/micropython/discussions/13505

[mahnunchik]

It seems XL9535 is logically the same chip as PCA9535/TCA9535

[mahnunchik]

Hi @flyte @mschlenstedt @BenjiU

I'd like to work on support of XL9535/PCA9535/TCA9535 chip and prepare PR. Could you please point me how to add a new device?

It seems there is no existing python "driver" published in pip. Could low level code be placed in this repo or should I make separate package?

---

Some kind of nodejs driver https://github.com/isky04/node-red-contrib-xl9535

[mschlenstedt]

I recently started to add some sensors to MQTTIO. As far as I know there's no developer documentation. I looked at the existing modules, take one which is similar to the one I would like to add and started and tested on a life system.

You'll finde the code here:

Sensors: https://github.com/flyte/mqtt-io/tree/develop/mqtt_io/modules/sensor
Input/Outputs: https://github.com/flyte/mqtt-io/tree/develop/mqtt_io/modules/gpio