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Return to Homebrew repeater protocol.

At the moment we have two versions of the Homebrew repeater protocol:

Disclaimer[edit]

This protocol should only be used for connecting repeaters directly. To connect networks, other protocols exist - please contact the dev team so that a good implementation can be made. We can't give support if the protocol is used for other things than connecting repeaters directly.

G4KLX MMDVMHost version[edit]

This version of the homebrew repeater protocol is implemented at BrandMeister as "MMDVM Host". The protocol is very close to a version of DL5DI but has some principal changes that are not documented in that specification. Over time, changes introduced have alienated these two protocols.

https://github.com/g4klx/MMDVMHost g4klx/MMDVMHost

Publicly-available version as initially specified by DL5DI[edit]

You can find the spec here: File:DMRplus IPSC Protocol for HB repeater.pdf This version of the homebrew repeater protocol is implemented at BrandMeister as "Homebrew Repeater"

Please note, this specification is not necessarily complete.

Corrections and additions[edit]

Site Beacon and RSSI (extensions)[edit]

Incoming call interrupt[edit]

Client could request server to interrupt current incoming call.

Cloud Messaging extension (push notifications)[edit]

One of the targets of the Homebrew Protocol is mobile devices such as mobile phones. This kind of devices have very strong requirements for power saving (Power Management for Mobile Devices). To make access for these devices more comfortable we added support of a native activation mechanism to Homebrew Protocol. Now we can activate devices via Google's Firebase Cloud Messaging which is a native mechanism for Android devices.

Managing connection state[edit]

To do this, the BrandMeister DMR Server supports the following new messages that may be sent by the client:

Downstream message[edit]

In the connection's idle state the server will send any data such as the headers of any voice calls, data calls, and CSBK (but not voice frames) via Cloud Messaging. Client applications should then go back and switch the connection to an active state to get a stream over UDP.

{
  "data" :
   {
     "type" : "Homebrew Repeater",
     "data" : "010203040506070809..."
   },
   "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
}

data/data field contains normal DMRD message of Homebrew Protocol in hexadecimal representation.

Application IDs and keys[edit]

We strongly recommended to use your own application token ID. In that case please provide us your application token ID and authorisation key. Both will be hardcoded in the source code. Default application token ID is 393838907279

Proposal for extensions on version 2.0[edit]

The main reason for this extension is support of homebrew terminal mode that should have different client UX and behaviour on the server side.

Configure terminal mode[edit]

The message should be sent instead of repeater Configuration protocol message immediately after authentication.
Request of client:

TRMENT01234567:callsign:software-version

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client
callsign is a text string of user callsign
software-version is a string to identify software and it's version

Subscribe group[edit]

Request of client:

TRMSUB01234567:TG4321

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client
TG4321 is a group ID

Unsubscribe group[edit]

Request of client:

TRMUNS01234567:TG4321

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client
TG4321 is a group ID

Unsubscribe all groups[edit]

Request of client:

TRMUNS01234567:ALL

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client

Enter exclusive mode[edit]

Request of client:

TRMEXL01234567:TG4321

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client
TG4321 is a group ID (P1234567 is a private ID)

Exit exclusive mode[edit]

Request of client:

TRMEXL01234567:EXIT

Response of server:

TRMACK01234567

01234567 is a hexadecimal ID of client

DMR Data[edit]

Slot flag should be unset.


Examples[edit]

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