How to connect android phone via websocket with Node-RED to recieve messages

General
1

Hi I am currently working on a project for my university and I am not really familiar with Node-RED, and Java Websockets.

Bascily the Project is a voice assistant:

  1. you speak into a Rasspberry PI which runs Rhasspy(voice to text) -> creating intents -> which are send to Node-RED in Json format
  2. Node-RED recieves intents in Json Format. -> send to Android App(jsut display data for now)
  3. I want to get the data on my android Phone.

Right now I have my Rasspberry PI connected with my Node-RED server and I am sending "intents" which contain data in Json format this is working so far. For example I say: " how is the weather " -> I get via an input websocket: Intent: object
name: "weather"
.....
text: "how is the weather"

Now I want to get this data in Json format with my android(running Java and want to use Websockets(OkHttp) ) phone via websockets but I am not sure how to get it are there already any example on how to connect my phone to the Node-RED server and get the Json data?

My idea now:

  1. Run a websocket client on my phone which connects to Node-RED:ws://......:1880
  2. Create "output websocket" in Node-RED which sends payload(Json data) to my android
    --> now jsut display text^^

Excuse my english is not my mother language :smiley:
I appreciate any help and idea :slight_smile: :vulcan_salute:

2

you could install node-red on the phone using termux app. On my other devices i have automate with a mqtt tasker plugin.

3

Thank you already :slight_smile:
is there any good guide/example?
:vulcan_salute:

4

Yes in the getting started section of the documentation link above
https://nodered.org/docs/getting-started/android

5

What are you going to do with the data once you have it in the phone. Have you considered something like Telegram if you are just trying to get notifications?

6

Hi, once I get the data on my phone I want to build an URL with the recieved data for REST-API.

For example you ask "what food today in mensa" -> I build URL for example: https......./mensa/today -> and phone will be able to displlay JSON from Rest-API

7

Are you going to write an Android app for that?

8

Automate would do all that, no need to install node-red As said you can run a mqtt or http plugin or use google firebase messaging, and receive the data, Automate can display notification, dialogs or you can use Web dialogs and build your own html/javascript page. This would probably be less resource/battery hungry. Automate could also call your rest API

9

yes, I wrote already an APP hardcoded for Rest-API so far but want to switch it to the correct url with the recieved parameter from Node RED and Tasker so my app is more flexible and I get correct data on display :slight_smile:

10

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