openwifi/doc/known_issue/notter.md

# Known issue

- [Network issue in quick start](#Network-issue-in-quick-start)
- [EXT4 fs error rootfs issue](#EXT4-fs-error-rootfs-issue)
- [antsdr e200 UART console](#antsdr-e200-UART-console)
- [Client can not get IP](#Client-can-not-get-IP)
- [No space left on device](#No-space-left-on-device)

## Network issue in quick star

- OS: Ubuntu 22 LTS
- image: [openwifi img](https://drive.google.com/file/d/1fb8eJGJAntOciCiGFVLfQs7m7ucRtSWD/view?usp=share_link)

If can't ssh to the board via Ethernet for the 1st time, you might need to delete /etc/network/interfaces.new on SD card (on your computer).

If still can't ssh the board via Ethernet, you should use UART console (/dev/ttyUSBx, /dev/ttyCH341USBx, etc.) to monitor what happened during booting.

## EXT4 fs error rootfs issue

Sometimes, the 1st booting after flashing SD card might encounter "EXT4-fs error (device mmcblk0p2): ..." error on neptunesdr, changing SD card flashing tool might solve this issue. Some tool candidates:
- gnome-disks
- Startup Disk Creator
- win32diskimager

## antsdr e200 UART console

If can't see the UART console in Linux (/dev/ttyUSB0 or /dev/ttyCH341USB0), according to https://github.com/juliagoda/CH341SER, you might need to do `sudo apt remove brltty`

## Client can not get IP

If the client can not get IP from the openwifi AP, just re-run "service isc-dhcp-server restart" on board and do re-connect from the client.

## No space left on device
It might be due to too many dmesg/log/journal, disk becomes full. 
```
systemd-journald[5694]: Failed to open system journal: No space left on device
```
You can try following operations.
```
systemd-tmpfiles --clean
sudo systemd-tmpfiles --remove
rm /var/log/* -rf
apt --autoremove purge rsyslog
```
Add followings into `/etc/systemd/journald.conf`
```
SystemMaxUse=64M
Storage=volatile
RuntimeMaxUse=64M
ForwardToConsole=no
ForwardToWall=no
```