Adapt google assistant's gRPC sample app for working with respeakerd.

Please refer to Google Assistant's documentations.

Please refer to here.

Please refer to here.

In this step, it's a little bit different from the Google's guide. Since we will use the pydbus library, which depends on the gi.repository library, it's not easy to install gi.repository in a python virtual env. But the system of ReSpeaker has this library builtin. So here we're going to skip the python virutal env setup from the Google's guide.

sudo apt-get install portaudio19-dev libffi-dev libssl-dev
sudo pip install -U googleassistant_respeakerd
google-oauthlib-tool --scope https://www.googleapis.com/auth/assistant-sdk-prototype --save --headless --client-secrets /path/to/credentials.json

You should see a URL displayed in the terminal:

Please visit this URL to authorize this application: https://...

Copy the URL and paste it into a browser (this can be done on any machine). The page will ask you to sign in to your Google account. Sign into the Google account that created the developer project in the previous step.

After you approve the permission request from the API, a code will appear in your browser, such as "4/XXXX". Copy and paste this code into the terminal:

Enter the authorization code:

If authorization was successful, you will see a response similar to the following:

credentials saved: /path/to/.config/google-oauthlib-tool/credentials.json

If instead you see InvalidGrantError, then an invalid code was entered. Try again, taking care to copy and paste the entire code.

Please refer to here, except that you should replace the googlesamples-assistant-pushtotalk command with googlesamples-assistant-respeakerd. That is,

googlesamples-assistant-respeakerd --project-id my-dev-project --device-model-id my-model

• Can not be interrupted (waked) when the assistant's speaking something