Provide a way to send errors from the daemon to the client
Issue generated from Tuleap's migration script. Originally submitted by: Alexandre Viau (aviau)
Currently, there is no way for the daemon to send error messages to the client.
For example, during a call, the state may change to failed but there is no explaination about why it has happened.
There should be a way to send error messages, for example "TLS handshake failed", to the client.
This may or may not be the same thing as sending status information, for example information on packet loss, which could be displayed in the clients.