Iwchan usage, wiki

[reinerotto]

I have a problem using iwchan, as described on wiki. 'iwchan list' works for me, but 'iwchan get' always gets an empty string. Running 21.02.03, on GLiNet AR300M16.
BTW: Isn't "chmod +x iwchan.sh" missing ?

[pavelgl]

@reinerotto

'iwchan get' always gets an empty string.

Apparently, currently there is no new channel that meets the requirements.

It calculates the load to frequency distribution and selects the channel with the least load.
The threshold frequency and load parameters help to minimize excessive channel change.

The default thresholds are as follows:

if(freq_thr == "") freq_thr = 15
if(load_thr == "") load_thr = 1000

This means that the load of the new channel must be at least 1001 units lower and the space between the new and the current channel must be at least 20Mhz.
If these conditions are not met, the function returns nothing.

if(freq_diff < freq_thr || load_diff < load_thr) return

If you want to see the channel with the least load without any conditions, set the thresholds to zero.

root@OpenWrt:~# awk -f iwchan.awk get
root@OpenWrt:~# awk -f iwchan.awk get phy1 0 0
11
root@OpenWrt:~#

@reinerotto

BTW: Isn't "chmod +x iwchan.sh" missing ?

0 4 * * * . /root/iwchan.sh

Running the script using source does not require execute permissions or shebang.

[reinerotto]

@pavelgl

currently there is no new channel

Ah, this should be the reason. Thanx.