Pat utilization of external TNC (Kenwood TM-D710G)

[James]

I am trying to get pat to utilize a serial TNC connection to my Kenwood 710G TNC.  Connection alias as follows:

"

serial-tnc": {

    "path": "/dev/ttyUSB0",

    "baudrate": 9600,

    "type": "Kenwood"

  },

When I attempt a connection I see it successfully query the Kenwood TNC but nothing further occurs. There are no commands sent to actually commence the creation of a session.  Is this just a non-supported function in PAT? This works successfully with the Windows Winlink clients without issue.

At start of session creation:

2020/01/19 19:27:57 Kenwood Radio Modem

2020/01/19 19:27:57 AX.25 Level 2 Version 2.0

2020/01/19 19:27:57 Release 09/Mar/11 3Chip ver 1.02

2020/01/19 19:27:57 Checksum $1859

2020/01/19 19:27:57 cmd:ECHO     was OFF

2020/01/19 19:27:57 cmd:FLOW     was OFF

2020/01/19 19:27:57 cmd:XFLOW    was ON

2020/01/19 19:27:57 cmd:LFIGNORE was ON

2020/01/19 19:27:57 cmd:AUTOLF   was OFF

2020/01/19 19:27:57 cmd:CR       was ON

2020/01/19 19:27:57 cmd:8BITCONV was ON

2020/01/19 19:27:57 cmd:NEWMODE  was ON

2020/01/19 19:27:57 cmd:MYCALL   was KK4NVP

2020/01/19 19:27:57 cmd:HBAUD    was 1200

2020/01/19 19:27:57 cmd:PACLEN   was 255

2020/01/19 19:27:57 cmd:TXDELAY  was 10

2020/01/19 19:27:57 cmd:PERSIST  was 190

2020/01/19 19:27:57 cmd:SLOTTIME was 5

2020/01/19 19:27:57 cmd:FULLDUP  was OFF

2020/01/19 19:27:57 cmd:MAXFRAME was 6

2020/01/19 19:27:57 cmd:FRACK    was 5

2020/01/19 19:27:57 cmd:RESPTIME was 0

2020/01/19 19:27:57 cmd:NOMODE   was ON

2020/01/19 19:27:57 cmd:cmd:

Thanks,

KK4NVP

[Michael Pittaro]

I run pat with a D-710 through the Linux AX-25 stack.  I've never tried the serial connection, and frankly didn't realize it could be used.

The relevant code seems to be at https://github.com/la5nta/wl2k-go/blob/master/transport/ax25/kenwood.go 

As best I can tell, after the output you described, pat should be sending a "c <targetcall>" to the kenwood tnc, and expects a connected or disconnected response from the TNC.      Somehow/somewhere, that seems to be where things are getting stuck.

There are some comments in the code about flow control that might be relevant, but I don't have any better suggestions.

mike, kj6vcp

[James]

Thanks for the info, I will give it a shot.  I am going to see if I can get it operational by putting the TNC in KISS mode and calling it from AX25.

[James]

Tried putting it in KISS mode and connecting and was partially successful.  I seem to be getting the same problem that I have seen in multiple threads.  PAT and the TNC don't communicate well and I get an unexpected EOF error.  Using the D-710 TNC from RMS Express on Windows runs perfectly.