What is the correct way to send unsolicited replies based on events ?

My use case is to simulate a basic serial device over tcp that responds to commands but also sends unsolicited messages

The doc's strings and Readthedocs are great but I feel I am missing something

I am using a TCP Stream Based on Motor Example

I have successfully implemented Cmd's and get the correct responses

I would like to get an `unsolicited_reply()` from the `StreamHandler` when the following events happen

1. a new connection is made to the simulation interface with Telnet Host:Port (no data yet sent from Client) -> Generates a Welcome message
2. a periodic (Non Regular - random time interval) event happens in the simulated Device subclassing `StateMachineDevice` and sends an `unsolicited_reply` to the TCP client, ie simulating a state change through `lewis-control device ....`
3. a periodic (regular - fixed time interval) variant of 2.