Command message routing protocol based on Beidou communication link

The invention discloses a command message routing protocol based on a Beidou communication link. A multicast command machine carries out top layer control. The multicast command machine controls a command machine B1 and the command machine B2 in a middle layer. The command machine B1 and the command machine B2 control subordinate users at lower ends. Multiple subordinate users are set. An output end of a broadcast command machine A1 is connected with an input end of a user machine A1a, the input end of the user machine A1b and the input end of the user machine A1c. The output end of the user machine A1a is connected with the input end of the command machine B1. The output end of the user machine A1b is connected with the input end of the command machine B2. The output end of the user machine A1c is connected with the input end of the command machine B3. The protocol makes up for the defects that a command relationship is single, layers are few and command functions are simple in an RDSS service; and the probl