How to keep the TX Power unchanged after a power cycle

bigboy061293 · October 19, 2025, 5:41pm

Dear community,

Given the MM8108 working on OpenWrt with BCF bcf_mf15457.bin, the TX Power can be modified by iw command. For example, to change the TX power to 10dBm, this is how I do:

iw wlan0 set txpower fixed 1000

Confirm the change with iwinfo

After a power cycle, the TX power comes back to the default value. I wonder if there is way to save the value without running iw command again? This is also important for an external FEM application because we may not want to burn the PA’s input port.

Thanks and regards,

V.

james.haggerty · October 22, 2025, 10:24pm

The best way to save the txpower would be to:

set it in UCI
add support in morse.sh for setting it on device bring up

To do this:

modify /lib/netifd/wireless/morse.sh to add these lines after iw phy “$phy” set frag

    if [ -n "$txpower" ]; then
        iw phy "$phy" set txpower limit "${txpower%%.*}00"
    else
        iw phy "$phy" set txpower auto
    fi

set txpower in uci, something like:

uci set wireless.radio0.txpower=10
uci commit
reload_config

This should persist on next boot, which you can validate using iw.

Thanks for pointing this out; leaving out txpower here was an oversight, and will be fixed in our next release.

bigboy061293 · October 23, 2025, 12:39am

Thank you,

I will try and get back with the result.

Regards,

V.

bigboy061293 · October 28, 2025, 2:34pm

Hi @james.haggerty, please see my updates below:

Regarding the the morse.sh file, I can not find the directory you mentioned.

root@OpenWrt:/lib# drwxr-xr-x 1 root drwxr-xr-x 1 root drwxr-xr-x 2 root drwxr-xr-x 6 root drwxr-xr-x 3 root -rw-r–r-- 1 root lrwxrwxrwx 1 root lrwxrwxrwx 1 root lrwxrwxrwx 1 root -rwxr-xr-x 1 root -rw-r–r-- 1 root -rwxr-xr-x 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root lrwxrwxrwx 1 root -rwxr-xr-x 1 root -rw-r–r-- 1 root lrwxrwxrwx 1 root lrwxrwxrwx 1 root -rwxr-xr-x 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root -rwxr-xr-x 1 root -rw-r–r-- 1 root -rw-r–r-- 1 root drwxr-xr-x 3 root drwxr-xr-x 5 root drwxr-xr-x 2 root drwxr-xr-x 2 root drwxr-xr-x 1 root drwxr-xr-x 2 root ls -al root 3488 Oct 2 02:21 . root 3488 Oct 16 14:57 .. root 29 Oct 9 19:12 config root 91 Oct 9 19:12 firmware root 209 Oct 9 19:12 functions root 9596 Oct 9 19:12 functions.sh root 7 Oct 9 19:12 ld-musl-aarch64.so.1 → libc.so root 18 Oct 9 19:12 libatomic.so → libatomic.so.1.2.0 root 18 Oct 9 19:12 libatomic.so.1 → libatomic.so.1.2.0 root 65539 Oct 9 19:12 libatomic.so.1.2.0 root 65539 Oct 9 19:12 libblobmsg_json.so.20230523 root 590849 Oct 9 19:12 libc.so root 65906 Oct 9 19:12 libfstools.so root 132 Oct 9 19:12 libgcc_s.so root 131088 Oct 9 19:12 libgcc_s.so.1 root 65553 Oct 9 19:12 libjson_script.so.20230523 root 65539 Oct 9 19:12 libpreload-seccomp.so root 65539 Oct 9 19:12 libpreload-trace.so root 22 Oct 9 19:12 libsahtrace.so → libsahtrace.so.v1.14.0 root 65545 Oct 9 19:12 libsahtrace.so.v1.14.0 root 65539 Oct 9 19:12 libsetlbf.so root 19 Oct 9 19:12 libstdc++.so → libstdc++.so.6.0.30 root 19 Oct 9 19:12 libstdc++.so.6 → libstdc++.so.6.0.30 root 1901035 Oct 9 19:12 libstdc++.so.6.0.30 root 2568 Oct 9 19:12 libstdc++.so.6.0.30-gdb.py root 65617 Oct 9 19:12 libubox.so.20230523 root 65698 Oct 9 19:12 libubus.so.20230605 root 65619 Oct 9 19:12 libuci.so root 65539 Oct 9 19:12 libustream-ssl.so root 66674 Oct 9 19:12 libvalidate.so root 31 Oct 9 19:12 modules root 251 Oct 9 19:12 netifd root 32 Oct 9 19:12 network root 453 Oct 9 19:12 preinit root 3488 Oct 2 02:21 upgrade root 50 Oct 9 19:12 wifi

I found the same file name, it locates in the wifi sub-folder. I attached the file on the reply in form of text file.

morse.txt (5.7 KB)

I also can not find the frag you mentioned iw phy “$phy” set frag

Regarding the uci commands it seems not to change the power read by the info. I also found that the result of uci get wireless.radio{x}.txpower and iwinfo are inconsistant. Please refer to my log below for further information

root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 31 dBm  Link Quality: 70/70
Signal: -37 dBm  Noise: unknown
Bit Rate: 65.0 MBit/s
Encryption: WPA2 PSK (CCMP)
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: “12345678”
Access Point: D8:3A:DD:8D:07:74
Mode: Mesh Point  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib# uci set wireless.radio0.txpower=10
root@OpenWrt:/lib# uci set wireless.radio1.txpower=10
root@OpenWrt:/lib# uci commit
root@OpenWrt:/lib# reload_config
root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 10 dBm  Link Quality: 70/70
Signal: -38 dBm  Noise: unknown
Bit Rate: 58.5 MBit/s
Encryption: unknown
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: unknown
Access Point: 18:9B:A5:19:0F:02
Mode: Mesh Point  Channel: unknown (unknown)  HT Mode: HT20
Center Channel 1: unknown 2: unknown
Tx-Power: 0 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: none
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: unknown (unknown)  HT Mode: HT20
Center Channel 1: unknown 2: unknown
Tx-Power: 0 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 10 dBm  Link Quality: 70/70
Signal: -39 dBm  Noise: unknown
Bit Rate: 52.0 MBit/s
Encryption: unknown
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: “12345678”
Access Point: D8:3A:DD:8D:07:74
Mode: Mesh Point  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: unknown (unknown)  HT Mode: HT20
Center Channel 1: unknown 2: unknown
Tx-Power: 0 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 10 dBm  Link Quality: 70/70
Signal: -38 dBm  Noise: unknown
Bit Rate: 52.0 MBit/s
Encryption: unknown
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: “12345678”
Access Point: D8:3A:DD:8D:07:74
Mode: Mesh Point  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 10 dBm  Link Quality: 70/70
Signal: -38 dBm  Noise: unknown
Bit Rate: 52.0 MBit/s
Encryption: unknown
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: “12345678”
Access Point: D8:3A:DD:8D:07:74
Mode: Mesh Point  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 22 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib# uci get wireless.radio0.txpower
10
root@OpenWrt:/lib# uci get wireless.radio1.txpower
10
root@OpenWrt:/lib#

And iw __ set txpower fixed _ command will always give an effective result read by iwinfo

root@OpenWrt:/lib# iw wlan0 set txpower fixed 1000
root@OpenWrt:/lib# iwinfo
phy1-sta0 ESSID: “Hoa Vu”
Access Point: A0:65:18:13:3B:FB
Mode: Client  Channel: 7 (2.442 GHz)  HT Mode: HT20
Center Channel 1: 7 2: unknown
Tx-Power: 10 dBm  Link Quality: 70/70
Signal: -39 dBm  Noise: unknown
Bit Rate: 57.7 MBit/s
Encryption: unknown
Type: nl80211  HW Mode(s): 802.11ac/b/g/n
Hardware: 02D0:A9A6 0000:0000 [Cypress CYW43455]
TX power offset: none
Frequency offset: none
Supports VAPs: no  PHY name: phy1

wlan0     ESSID: “12345678”
Access Point: D8:3A:DD:8D:07:74
Mode: Mesh Point  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 10 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

wlan1     ESSID: “OpenWrt”
Access Point: 1A:9B:A5:19:0F:02
Mode: Master  Channel: 8 (906.000 MHz)  HT Mode: HT40
Center Channel 1: 8 2: unknown
Tx-Power: 10 dBm  Link Quality: unknown/70
Signal: unknown  Noise: unknown
Bit Rate: unknown
Encryption: WPA3 SAE (CCMP)
Type: dot11ah  HW Mode(s): 802.11ah
Hardware: USB 325B:8100 [Morse Micro USB-MM810x]
TX power offset: none
Frequency offset: none
Supports VAPs: yes  PHY name: phy0

root@OpenWrt:/lib#

Please have a look,

Thanks and regards,

V.

james.haggerty · October 28, 2025, 9:36pm

What morse OpenWrt image are you using? As far as I know, all of them should have this file. Are you sure you check the right location? It seems like you’ve listed the /lib directory, which is not that relevant.

root@halowlink1-f4a1:~# ls /lib/netifd/wireless/
mac80211.sh  morse.sh

EDIT: my apologies, I realise I switched netifd and wireless. I’ve amended my original message to fix the path.

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How to keep the TX Power unchanged after a power cycle

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