Hi friends, ran into some trouble doing the following — how can I sign messages between a non-js framework app with tonconnect/tonkeeper? To be specific a flutter app.

I had managed to create and test the contracts on node js with ton libraries. To which it works perfectly.

But I want to achieve this on flutter
I have done alot of research but seems none worked.

Suggestions and questions are welcomed.

Ton connect is just a protocol for communications between the app and the wallet. You don't need to "sign" anything.

1) generate link (or QR code) for authorization
2) fetch the user wallet's data (address, balance etc)
3) when you need to send some transaction from user's wallet, use the ton connect API to do so

Everything above is well covered in documentation:
https://ton.org/docs/develop/dapps/ton-connect/integration