What message is that? Do you have documentation?
yes,we have the file,
when the device send 7878058A000688290D0A, the server reply UTC time to the device . for example reply 78780B8A19081C0D27250003A8170D0A
this 19 08 1C 0D 27 25 is the UTC time ,years/months/hours/mins/
Where is the documentation?
7878058A000688290D0A if device send this raw data to server, the server will reply UTC time to the device?