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D-Rats on DMR?

 

Hi All,


Are they any plans to get d-rats running over dmr data at all?


I am by no means a coder but would be happy to do any testing.


I am using a hytera 685 hand held radio, I can connect to the PC via data cable I see a virtual network adapter is created and a 192.168.x.y address is given (created on a hash from your DMR ID)


There is also an over the air IP address in the 10.x range.


Would be great if you could maybe work with Hytera as they have an apps team:

?


Looking forward to hearing feedback soon


best 73 and thanks


James / W02I / M0JFP / 2e1avx
 

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Hello James,

I don't own a Hytera DMR radio but I've been following the technology a bit.? I understand that first, your loaded code plug designates one time slot for data (uncommon here in Northern California) for repeaters but if that's not in place, you should still be able to do things via Simplex.? Assuming a simplex operation, it looks like Hytera's current solution for Data transfer is via the DMR_SW_DTP program (looks to be Windows only - based on .NET code).? I'm not aware of any *NIX (Linux, Mac, etc) program alternatives but maybe they exist or maybe it can run under Wine, etc.

In reading the Data Transfer documentation at , the real question is if this software has enabled forwarding where other computers on the LAN can use the DMR application as a "router".? The key test here is if you can send and receive "pings" between two computers via the DMR radio link.? If that works, I don't see why you couldn't setup a D-Rats Ratflector (server) on one machine and have the other client run D-rats (client) and just use standard TCP/IP networking to complete the connection.

--David
KI6ZHD



On 01/20/2016 08:20 AM, mb7usm@... [d-rats_group] wrote:

?

Hi All,


Are they any plans to get d-rats running over dmr data at all?


I am by no means a coder but would be happy to do any testing.


I am using a hytera 685 hand held radio, I can connect to the PC via data cable I see a virtual network adapter is created and a 192.168.x.y address is given (created on a hash from your DMR ID)


There is also an over the air IP address in the 10.x range.


Would be great if you could maybe work with Hytera as they have an apps team:

?


Looking forward to hearing feedback soon


best 73 and thanks


James / W02I / M0JFP / 2e1avx
 

Understanding DMR is the key to answering your question.
DMR literally switches on and off about every 30ms for whatever time slot you are on. That enables two conversations per channel.?
DRATS flows continuous data. Therefore half of the DRATS data would be lost when trying to transmit it on a DMR radio. There is no way to stop, buffer, and synchronize the DRATS data into the time slot yet. ?

The DRATS software would have to be modified to sync up to the time slot sync data packets, then only transmit data during the transmit cycle of the DMR radio between the header packet and the terminator packet.?

Keith
KC2OON
 

Agreed the only way would be to use existing data transfer methods. My answer below is really just for an easy connection like we can presently do with a DSTAR radio and a USB connection.

Keith
KC2OON
 

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Dstar's slow speed DV data transport is accessed via a RS232 serial port to Drats.? Drats then adds it's own simple framing into the payload to track the data flow (ACKs, retries, etc).? It's unclear to be how the Hytera DMR radios present data access via their USB driver but If we can get details on what it really does, we might be able to provide some ideas.

--David
KI6ZHD

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