Dynamically changing of Power level

Question

Hello, 
 
 I am using nRF52840, SDK_16.0.0, SoftDevice S140 V7.0.1 and Segger for flashing the image. I am using ‘ble_app_blinky’. 
 
 I want to send packet with different Tx power levels over serial interface. I am using sd_ble_gap_tx_power_set() to change Tx power. 
 
 1) During advertisement packet, if there is a serial command to change Tx power level, will it take immediately by calling sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV). 
 2) Also once device is connected, it there is a serial command to change Tx power level, will it take immediately by calling sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN) or do I need to reset. 
 
 Thanks & Regards 
 Vishnu Beema

Simonr · Accepted Answer

Hi 
 I'm sorry, but I'm struggling to see what you want to do here. Do you want the nRF52 to change the TX power whenever a serial command (over UART, SPI, or TWI for example) is received? I don't think we have an example doing such a thing, but you should be able to make a command trigging the sd_ble_gap_tx_power_set() command. You can check out the UART peripheral example which makes the device print "Exit!" and do nothing if q or Q is received over UART. 
 Best regards, 
 Simon

Simonr · Answer

Hi Vishnu 
 1. It should be possible to call sd_ble_gap_tx_power_set() in a connection and update it without disconnecting, but we don't have any examples doing so I'm afraid, so you'll have to implement that yourself. You can see a suggestion from my colleague here . 
 2. If you want to change the TX power while in a connection you should just have to use BLE_GAP_TX_POWER_ROLE_CONN as that is the parameter updating the TX power when you're in a connection. 
 Best regards, 
 Simon

Dynamically changing of Power level

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