Wireless autoconf

The UCI configuration

Inside /etc/config/qmp you can find some options related to wireless interfaes

These are the default parameters sharing all wireless interfaces

config 'qmp' 'wireless'
     option 'driver' 'mac80211'
     option 'country' 'UZ'
     option 'bssid' '02:CA:FF:EE:BA:BE'

driver can be `mac80211` for athXk, and `madwifi` for madwifi

And these are the config parameters for each wifi interface.

 config 'wireless'
     option 'channel' '44'
     option 'mode' 'adhoc'
     option 'name' 'qmp'
     option 'mac' '00:80:48:6b:25:b5'

 config 'wireless'
     option 'channel' '10'
     option 'mode' 'ap'
     option 'name' ''
     option 'mac' '00:80:48:6b:25:b6'


To apply this configuration to device, you must execute this commands:

. /etc/qmp/

This function takes the parameters from UCI and using the templates from: /etc/qmp/templates creates the openwrt wireless config
Templates are named like that: wireless.mac80211.adhoc wireless.madwifi.ap
Separed by dots, second name is the driver to use and third one is the mode.

These templates looks like this:

config wifi-device #QMP_DEVICE
    option type     mac80211
    option macaddr    #QMP_MAC
    option channel  #QMP_CHANNEL
        option diversity 0 # 0:off, 1:on
        option txantenna 0 # 0:auto, 1:main, 2:aux
        option rxantenna 0 # 0:auto, 1:main, 2:aux
    option country    #QMP_COUNTRY
    option outdoor    1
#    option txpower  1 

config wifi-iface
    option device    #QMP_DEVICE
    option mode    adhoc
    option ssid    #QMP_SSID
    option bssid    #QMP_BSSID
    option encryption none

As you can see, the special words starting with #QMP will be replaced by UCI parameters.
So you can play a little with templates. For example, there is a template named: `wireless.mac80211.adhoc-n`

But the function qmp_wireless_config requires a complete configuration from UCI. So there is another function to generate the UCI config.


To execute this function:

. /etc/qmp/

This generates de UCI qmp configuration, but not allways from zero. You can have some parameters configured and the function will configure the rest for you.

For example, you can have a configuration like this:

config 'wireless'
     option 'channel' '132'
     option 'mode' 'adhoc'

And after execute qmp_configure_wifi_initial you will have the rest of needed parameters

config 'wireless'
     option 'channel' '132'
     option 'mode' 'adhoc'
        option 'name' 'qmp'
     option 'mac' '00:80:48:6b:25:b5'

So, if you want to use the first device for meshing and the second one for access point, you can build the openwrt image with this kind of configuration:

config 'wireless'
     option 'mode' 'adhoc'

config 'wireless'
     option 'mode' 'ap'

And after the first startup qmp_configure_wifi_initial will be executed putting the rest of parameters.

The default configuration is read from file: /etc/qmp/templates/wireless.default.config looks like that:

driver mac80211
country UZ
bssid 02:CA:FF:EE:BA:BE
channel 44
mode adhoc

Also if the `mac` option is specified, the function will find this device that has this mac-address and use it. If not, it will use the first one free


This file is executed during first boot. It uses qmp_configure_wifi_initial and qmp_configure_wifi to leave wireless system ready.

If you want to reconfigure wireless system after first boot, you have to remove a control file named `/qmp_configured`

This script also executes the networking autoconfiguration (bmx6, olsr6...)

Updated by Pau Escrich about 13 years ago ยท 15 revisions