1. Start the tunnelbroker instance by running `cd services/tunnelbroker && cargo run`.
2. Connect to the tunnelbroker messages stream by the gRPC client with the deviceID `A`.
3. Add a simple publish to the `keyserver.js`:
```
import { tunnelbrokerPublisher } from './socket/tunnelbroker.js';
...
tunnelbrokerPublisher.publish('A','Some test data');
```
4. Start the keyserver using the `cd keyserver && yarn dev`.
5. The expected result is that the message is published and delivered to the gRPC client which is connected as a deviceID `A`.