fix: Clarify ZBT-2 hardware flow control

[burmistrzak]

Comments in the Nabu Casa firmware repository confirm that the ZBT-2 only features hardware flow control between the ESP32-S3 (acting as USB-UART adapter) and the MG24 SoC.

The host application (i.e. Z2M) should use software flow control instead.

[puddly]

Let's keep the docs as-is. I'd rather not have fragmented serial config when we release updated UART firmware.

ZHA uses hardware flow control for all ZBT-2s.

[burmistrzak]

Let's keep the docs as-is. I'd rather not have fragmented serial config when we release updated UART firmware.

Sure. 👌
Just that I get it right: You're planning to add flow control between the host and ESP32 as well, but it's currently not ready yet?

[burmistrzak]

I assume you were referring to this NabuCasa/zwave-esp-bridge#15 PR?

[puddly]

Sort of. We'll likely have an ESPHome firmware released at some point that replaces the native esp-idf serial proxy.

[burmistrzak]

Sort of. We'll likely have an ESPHome firmware released at some point that replaces the native esp-idf serial proxy.

Oh hell yeah! 🤟
Let me know if you need any helping hands.

[puddly]

Totally! I'll tag you in a roadmap when we formalize things a bit more in the future. For the most part everything is already done, there isn't much, just gotta plan out the ESPHome-over-raw USB part a bit more and see what it takes to get the ESPHome API working over non-TCP transports.