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New Model #9263

closed

Retevis RB75

Added by john Terry over 2 years ago. Updated about 2 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
-
Target version:
Start date:
08/06/2021
Due date:
% Done:

100%

Estimated time:
Equipment Loan/Gift Offered:
No
I read the instructions above:

Description

The Retevis RB75 is a GMRS HT. It seems to have come out recently. I bought a 5 pack and a programming cable and have started to play with them. They are not yet supported by CHIRP, and the included software is terrible.

https://www.retevis.com/RB75-Waterproof-Long-Standby-GMRS-Handheld-Two-way-Radios

I've sniffed the magic string from the included software, ".KVOGRAM" (with the first char as 0x02), but haven't determined the memory layout yet.

Attached is a factory default dat file read from the included program and an html page with the serial communication dump between the radio and the included program doing a read and two writes to the radio.

I have explored the existing retevis drivers, I believe this radio is likely close to an existing model.
I may try to code this myself as a weekend project, but if these details make it obvious to someone I'd love to see that.


Files

retevisRB75 Default.dat (4.7 KB) retevisRB75 Default.dat Retevis RB75 from radio saved with included programming software john Terry, 08/06/2021 03:40 PM
RB75 Serial Communication.html (270 KB) RB75 Serial Communication.html Dump of serial communication with radio and included programming software john Terry, 08/06/2021 03:40 PM
Actions #1

Updated by Jim Unroe about 2 years ago

How did you create the dump of the serial communications?

Jim KC9HI

Actions #2

Updated by Jim Unroe about 2 years ago

  • Status changed from New to In Progress
  • Assignee set to Jim Unroe
  • Target version set to chirp-legacy

Sample RB75 provided by Retevis.

Jim KC9HI

Actions #3

Updated by john Terry about 2 years ago

Jim Unroe wrote:

How did you create the dump of the serial communications?

Jim KC9HI

I used a windows program called "Serial Port Monitor", this is the html output from that. I didn't have a working linux / wine setup at the time. There's a much better chance I can get things working under wine now that I have the right hardware combination. I will try to get that working if needed.

Actions #4

Updated by john Terry about 2 years ago

The communication here should include a full read of the memory, and two writes to memory.

Actions #5

Updated by Jim Unroe about 2 years ago

john Terry wrote:

Jim Unroe wrote:

How did you create the dump of the serial communications?

Jim KC9HI

I used a windows program called "Serial Port Monitor", this is the html output from that. I didn't have a working linux / wine setup at the time. There's a much better chance I can get things working under wine now that I have the right hardware combination. I will try to get that working if needed.

OK. That is what I use here. I just export the "dump" view to a *.txt file. The reason I asked was I am trying to locate something simple-to-use and free that I can tell others to use to capture the transfer from/to their radio like you did.

Jim KC9HI

Actions #6

Updated by Jim Unroe about 2 years ago

  • Status changed from In Progress to Resolved
  • % Done changed from 0 to 100

A patch has been submitted. Support should be in the next CHIRP daily build following acceptance.

Jim KC9HI

Actions #7

Updated by john Terry about 2 years ago

Jim Unroe wrote:

A patch has been submitted. Support should be in the next CHIRP daily build following acceptance.

Jim KC9HI

That's amazing! Thanks Jim! I look forward to giving it a spin!

Actions #8

Updated by john Terry about 2 years ago

Jim Unroe wrote:

john Terry wrote:

Jim Unroe wrote:

How did you create the dump of the serial communications?

Jim KC9HI

I used a windows program called "Serial Port Monitor", this is the html output from that. I didn't have a working linux / wine setup at the time. There's a much better chance I can get things working under wine now that I have the right hardware combination. I will try to get that working if needed.

OK. That is what I use here. I just export the "dump" view to a *.txt file. The reason I asked was I am trying to locate something simple-to-use and free that I can tell others to use to capture the transfer from/to their radio like you did.

Jim KC9HI

FWIW, I did try both the wine approach, and the USBPCap approach to no avail. I may have gotten the USB way to work eventually with enough futzing. In this case, the radio software was using some serial API not yet implemented by wine, and raising a NotImplemented System.IO.Ports.SerialPort.set_ReceivedBytesThreshold error. The USBPcap method might've worked for me eventually, but I couldn't seem to get the right capture filter, and when I thought I had it, the file was only 2KB with very little in it when opened in wireshark... I'm not a windows user so this was difficult.

What I wanted to try was running a Windows VM on linux and passing through & sniffing the serial port from linux. I guess maybe next time ;)

I'd love to look at the patch, but I can wait until its in a mainline branch. Just curious, I was staring at the code myself for a while, but couldn't quite get it.

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