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# HyBBX + TNC2C
MAX25 prepares the TNC (recovery + KISS entry); HyBBX attaches with **`kiss_entry = none`**.
## Flow
```
max25d auto_start / max25-ctl start --hardware tncs --device tnc2c
↓ (software recovery + kiss on)
HyBBX Secondary starts packet_radio plugin (attach-only)
↓
KISS on serial → AX.25 sessions
```
Software recovery without power cycle: [TNC-RECOVERY.md](TNC-RECOVERY.md).
## Preparation (MAX25)
```bash
./scripts/max25-ctl start --hardware tncs --device tnc2c
# Production: max25d with [stack] auto_start = yes
```
One process per serial port — stop other userspace serial owners before HyBBX starts.
## HyBBX INI
Merge `share/hybbx/tnc2c-host.ini.example` or `stacks/tncs/hybbx-tnc2c.ini` into Secondary `hybbx.ini`:
```ini
[transport.packet_radio1]
tnc = tnc2c
device = /dev/ttyUSB0
baud = 19200
serial_line = 8n1
rts_dtr = yes
kiss_entry = none
persist = 255
[max25]
check = yes
```
Set `device`, callsign, and frequency for your station.
For HyBBX **without** max25d (standalone), use `kiss_entry = kiss_on` or `auto` instead — HyBBX runs its own recovery before KISS entry.
## Checks
- MAX25 prep returned host/KISS ready (boot-wait OK or max25d `ready`)
- `fuser` on device is empty before HyBBX start (max25d holds port in production)
- Log shows KISS active on the expected port
Full contract: [docs/HYBBX.md](../../docs/HYBBX.md)
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