Receiving station does not send acknowledgement

[jpnz0000]

When testing station to station transmission the receiving station does not send an acknowledgement

For this test a single byte is being transmitted from station 64 to station 32

The single byte has been received at station 32:

However, station 64 continues to transmit:

From station 32 diags there is a send error:

[2026-01-03T04:00:03Z INFO  sdl2_zxspectrum] ZX Spectrum 48k: cpu_hz: 3500000 T-states/frame: 69888 pixel density: 1
[2026-01-03T04:00:03Z INFO  sdl2_zxspectrum] ULA size: 232
[2026-01-03T04:00:03Z INFO  sdl2_zxspectrum] Interface 1 installed
[2026-01-03T04:00:03Z INFO  sdl2_zxspectrum] ZX-NET bind: 127.0.0.1:30000
[2026-01-03T04:00:21Z INFO  spectrusty_peripherals::network::zxnet] fake scout
[2026-01-03T04:01:47Z INFO  spectrusty_peripherals::network::zxnet] fake scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet_udp] recv: 24 [90, 88, 78, 69, 84, 0, 32, 64, 0, 0, 1, 10, 225, 76]
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] 128 got packet let it REST: 18 1.145429ms [32, 64, 0, 0, 1, 10, 225, 76]
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] got send resp 1

[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet_udp] err send last accepted: Uncategorized Os { code: 89, kind: Uncategorized, message: "Destination address required" }

[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] sent accept in 23.154µs
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] end of response expecting more data
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] got send resp 1
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] end of response and transmission

Station 64 diags - continues to transmit:

[2026-01-03T04:00:36Z INFO  sdl2_zxspectrum] ULA size: 232
[2026-01-03T04:00:36Z INFO  sdl2_zxspectrum] Interface 1 installed
[2026-01-03T04:00:36Z INFO  sdl2_zxspectrum] ZX-NET conn: 127.0.0.1:30000
[2026-01-03T04:00:57Z INFO  spectrusty_peripherals::network::zxnet] fake scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] fake scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK start from scout
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 20
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 40
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 0a
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: e1
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 4c
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] outbound header end
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] check immediate response
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 03
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: e1
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] outbound data end
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet_udp] sent: 24 size: 18
[2026-01-03T04:01:50Z INFO  spectrusty_peripherals::network::zxnet] check remote response
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] NO ACCEPT!
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] waited: 177786 0.050795965
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] verify scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK start from scout
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 20
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 40
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 0a
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: e1
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 4c
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] outbound header end
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] check immediate response
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 03
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 01
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: 00
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: ff
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] OUTPAK stop: e1
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] outbound data end
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet_udp] sent: 24 size: 18
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] check remote response
[2026-01-03T04:01:51Z INFO  spectrusty_peripherals::network::zxnet] NO ACCEPT!

etc...

Thank you

rx-log.gz
tx-log.gz

[royaltm]

From your logs I can see that you only bind station 32 and connect station 64. Because the communication is two-way this time, you have to bind both stations and connect them to each other:

station 32

RUST_LOG=info sdl2-zxspectrum -m 48k -i resources/roms/if1-2.rom --bind 0.0.0.0:30032 --conn 127.0.0.1:30064

[2026-01-03T11:45:09Z INFO  sdl2_zxspectrum] Interface 1 installed
[2026-01-03T11:45:09Z INFO  sdl2_zxspectrum] ZX-NET bind: 0.0.0.0:30032
[2026-01-03T11:45:09Z INFO  sdl2_zxspectrum] ZX-NET conn: 127.0.0.1:30064

station 64

RUST_LOG=info sdl2-zxspectrum -m 48k -i resources/roms/if1-2.rom --bind 0.0.0.0:30064 --conn 127.0.0.1:30032

[2026-01-03T11:44:48Z INFO  sdl2_zxspectrum] Interface 1 installed
[2026-01-03T11:44:48Z INFO  sdl2_zxspectrum] ZX-NET bind: 0.0.0.0:30064
[2026-01-03T11:44:48Z INFO  sdl2_zxspectrum] ZX-NET conn: 127.0.0.1:30032

This will fix your issue.

What could be improved is to allow stations to automatically connect to the station from which a packet was received. This way, only one station would need to point to the other one.

[jpnz0000]

This is working perfectly! Thank you so much for the information

[royaltm]

Let's leave the issues open, so I will remember to work on the improvements when I have some time.