ZoH and transmit_power

[chris-1243]

Everything is in the title. Is the setting transmit_power in Z2M taken into account with those firmware?
Even if I am completely aware that high transmit power may induce lots of noise instead of solving problem, this is an option which is well supported in NCP firmware. It also depends on the chip used for sure.

[Koenkk]

No, I think the OT RCP fw have an api to change the TX power, so probably nothing has to be changed in the fw to enable this.

[chris-1243]

transmit power is not set correctly in ZoH with your firmware unfortunately.

[2025-04-01 09:08:56.282] debug: z2m: Using zigbee-herdsman with settings: '"{"network":{"panID":32303,"extendedPanID":[194,127,88,72,204,173,236,87],"channelList":[20],"networkKey":"HIDDEN"},"databasePath":"/app/data/database.db","databaseBackupPath":"/app/data/database.db.backup","backupPath":"/app/data/coordinator_backup.json","serialPort":{"baudRate":460800,"rtscts":false,"path":"/dev/serial/by-id/usb-Silicon_Labs_Sonoff_Zigbee_3.0_USB_Dongle_Plus_0001-if00-port0","adapter":"zoh"},"adapter":{"disableLED":false,"transmitPower":10}}"'

[2025-04-01 09:08:56.559] info: ot-rcp-driver: ======== Network started (PHY: txPower=5dBm rssi=-17dBm rxSensitivity=-90dBm ccaThreshold=undefineddBm) ========

Any idea where to look for in order to solve this ? It is working fine with Silabs chip and firmware made by @Nerivec.

By the way, I may provide more debug logs or any sniff if required

[Nerivec]

As far as I can tell from https://github.com/Koenkk/ot-ti/blob/main/src/radio.c it is implemented, but it has a whole bunch of clamping/mapping applied. Could just be that the chip is limited to that value (it will round down to nearest supported value when set).

https://github.com/Koenkk/ot-ti/blob/3537acacb3f05b82dbf834ee6413cad27f5a8662/src/radio.c#L184-L207