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The initial approach was to run BLE and Wi-Fi simultaneously. Provisioning sometimes worked. It seems like there was some interference. Then switched to run BLE with Wi-FI off. When I got Wi-Fi credentials, switched BLE off, and turned Wi-Fi on. It still had some issues. Turned out when slowed down SPI bus, it started working. Only tested with Home Assistant and have to fork and patch rs-matter-embassy

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re: wifi/ble together

That sounds like the crate didn't have coexistence enabled or the defaults were really odd - so much boring stuff to write about BLE/WiFi Coex, but the short is "the default settings" are pretty good for low bandwidth IoT devices.

I'll peek at the code out of interest :)

What OP says

> Turned out when slowed down SPI bus, it started working.

reeks of either RF interference issues or power rail issues. Power is not the strongest domain of anything RPi so that's where I'd look first.

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