generally, ifconfig wlan9 up works, but not in my special case:
I use the onboard wifi both to connect to the internet ( wlan0, 192.168.0.0/24 at least here at home) and to provide an AP ( wlan9, 10.10.10.0/24), where for example the wind sensor (10.10.10.72) is connected.
after some time, wlan0 still works fine, but wlan9 is gone, and i cannot restart it. I booted the Pi last evening, and it was recording wind data via wlan9 for ~ 10h, but then it stopped around 0605 this morning.
The windsensor (yachta) is just fine, and switched back to internal AP mode, when it lost the connection to the PI.
I use the onboard wifi both to connect to the internet ( wlan0, 192.168.0.0/24 at least here at home) and to provide an AP ( wlan9, 10.10.10.0/24), where for example the wind sensor (10.10.10.72) is connected.
after some time, wlan0 still works fine, but wlan9 is gone, and i cannot restart it. I booted the Pi last evening, and it was recording wind data via wlan9 for ~ 10h, but then it stopped around 0605 this morning.
The windsensor (yachta) is just fine, and switched back to internal AP mode, when it lost the connection to the PI.
Code:
root@openplotter:~# ping -c 3 10.10.10.72
PING 10.10.10.72 (10.10.10.72) 56(84) bytes of data.
^C
--- 10.10.10.72 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2055ms
root@openplotter:~# ifconfig wlan9
wlan9: error fetching interface information: Device not found
root@openplotter:~# ifconfig wlan9 up
wlan9: ERROR while getting interface flags: No such device
root@openplotter:~# ping -c 3 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=5.31 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=3.93 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=7.35 ms
--- 192.168.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 3.925/5.529/7.354/1.408 ms
root@openplotter:~# ifconfig wlan0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.234 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 2a02:8070:4280:b620:dea6:32ff:fef6:2b71 prefixlen 64 scopeid 0x0<global>
inet6 fe80::dea6:32ff:fef6:2b71 prefixlen 64 scopeid 0x20<link>
ether dc:a6:32:f6:2b:71 txqueuelen 1000 (Ethernet)
RX packets 16528 bytes 1502361 (1.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9004 bytes 2029363 (1.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
root@openplotter:~#