TX Power Service Server API
src/ble/gatt-service/tx_power_service_server.h
/**
* @brief Init TX Power Service Server with ATT DB
* @param tx_power_level
*/
void tx_power_service_server_init(int8_t tx_power_level);
/**
* @brief Update TX power level
* @param tx_power_level_dBm range [-100,20]
*/
void tx_power_service_server_set_level(int8_t tx_power_level_dBm);