Hello again, I have a question about using MD788 to send text messages. Currently I have a MD788 (and HM788) and I would like to use a custom application (which I will build it myself) to send messages to my HM788. Do you know where to start to do this? As far as I know, there is something like hytera ADK/SDK/API but I don't know where to obtain it. When I search through internet, looks like the documentation for hytera's custom application is pretty much hard to find, even if it is just the example of its implementation. There is one though, but I have to pay for it. I hope anyone here can give me a clue regarding this matter, and any response is really appreciated, thx before.