You can send SysEx with "SysEx" Action. In case you set "initial" flag, the message will be sent on Preset load.
You can also implement some "Initialization dialog", see MCU build in preset for example (Hello Logical Control and it's timer, do not forget to save your current preset before switching!). The Idea: you send "Hello" every second (in timer) and as soon as there is a reply you changed State to "Online", which prevent the timer to continue. That way you also know the device is found.