Yihui Xiong

It seems that we need [a patch for rfkill-gpio](https://github.com/friendlyarm/linux/commit/de8acffc1a023f92f12fa9c9a4ff9656e9be14a2#diff-f03340c270d98b07cd53c0768aa766c8) to add bluetooth reset pin to rfkill-gpio

I haven't tried the DS_CNN network. At that time, just DNN was available. You need make some changes to make it work with DS_CNN.

The document is find of outdated. We can follow https://github.com/google/OpenSK/blob/master/docs/install.md to build the firmware. ``` ./setup.sh ./deploy.py --board=nrf52840_mdk_dfu --opensk --programmer=none ``` It will create a hex at the `target` directory.

Please use https://github.com/makerdiary/OpenSK/tree/master which includes a commit to avoid breaking the bootloader.

The message can be ignored. What issue did you have? Are you able to run `alexa-tap`?

The hardcoded ReSpeaker client ID is a feature for these who just want to try Alexa as quick as possible.

The following is the settings of the respeaker.  No idea why you can't add http url. I just tried to add `http://192.168.1.1:3000/authresponse` to Allowed Return URLs, it works. Maybe...

It seems pyaudio is not installed. To install it, run `sudo apt install python3-pyaudio` or `sudo pip3 install pyaudio`

How about adding the command to `/root/autorun.sh`. Maybe add some delays to wait the sound card is ready.

There are 2 differences between nrf52840-mdk-usb-dongle and nrf52840-mdk. One is the pins of LEDs and buttons, the other is nrf52840-mdk has a builtin CMSIS-DAP debug adapter but doesn't have a...