How to modify tx power in mesh-sdk-4.0 LPN example

[jowei]

Hi Nordic

I want to change mesh-sdk-4.0 LPN example tx output power to 4dbm, including proxy broadcast, mesh packet, 

I try to change "RADIO_POWER_NRF_0DBM" in whole mesh-sdk-4.0 to "RADIO_POWER_NRF_POS4DBM", 

in set_default_broadcast_configuration(), scanner_init(), core_tx_tx_power_delete(), core_tx_lpn_init()

But it seems not change the tx power because nrf connect APP still show similar RSSI, could you tell me how to modify tx power of mesh-sdk-4.0?

Regards,

Joseph

[Hung Bui]

Hi Joseph, 

When you mentioned the RSSI showed on nRFConnect app, I assume it's when the device was not provisioned and advertising in PBGATT mode. 

To change TX power when the device doing BLE advertising for provisioning, you would need to call sd_ble_gap_tx_power_set() after you init the BLE stack (ble_stack_init() ) 

Note that this function wouldn't affect when the device doing normal mesh activity. For that you would need to call advertiser_tx_power_set()

I would suggest to start testing on a normal mesh node instead of LPN node. 

[Jui-Chou (Rick) Chung]

Hello Joseph,

Since in the migration guide, mentioned that:

"This means that your applications should no longer invoke any special API to store or restore parameters. The parameters will be stored or restored when they are changed via the appropriate API, for example mesh_opt_core_tx_power_set() or mesh_opt_core_tx_power_get()"

We can call mesh_opt_core_tx_power_set() in the runtime for setting the TX power, and the configuration will be stored in the flash.

But the upon information will only affect the ADV-bearer, for GATT-bearer, you may need to use sd_ble_gap_tx_power_set() for setting the TX power. Since the GATT function is relied on softdevice. Please check the following link:

https://devzone.nordicsemi.com/f/nordic-q-a/38292/mesh-proxy-sdk2-1-1-tx-power-of-nrf52832

Hope this can do help.

Best regards,

Rick  

[jowei]

Hi Bui:

Noted for

"I would suggest to start testing on a normal mesh node instead of LPN node. ", thanks.