RE: How to reduce the bluetooth range in nrf52840.

awneil — Wed, 20 Feb 2019 11:04:25 GMT

That is exactly the function described in the post I linked earlier!

devzone.nordicsemi.com/.../just-set-tx-power

RE: How to reduce the bluetooth range in nrf52840.

Hit — Wed, 20 Feb 2019 06:05:36 GMT

In ble_gap.h how to define the tx_power

/**@brief Set the radio's transmit power.
 *
 * @param[in] role The role to set the transmit power for, see @ref BLE_GAP_TX_POWER_ROLES for
 *                 possible roles.
 * @param[in] handle   The handle parameter is interpreted depending on role:
 *                     - If role is @ref BLE_GAP_TX_POWER_ROLE_CONN, this value is the specific connection handle.
 *                     - If role is @ref BLE_GAP_TX_POWER_ROLE_ADV, the advertising set identified with the advertising handle,
 *                       will use the specified transmit power, and include it in the advertising packet headers if
 *                       @ref ble_gap_adv_properties_t::include_tx_power set.
 *                     - For all other roles handle is ignored.
 * @param[in] tx_power Radio transmit power in dBm (see note for accepted values).
 *
  * @note Supported tx_power values: -40dBm, -20dBm, -16dBm, -12dBm, -8dBm, -4dBm, 0dBm, +2dBm, +3dBm, +4dBm, +5dBm, +6dBm, +7dBm and +8dBm.
  * @note The initiator will have the same transmit power as the scanner.
 * @note When a connection is created it will inherit the transmit power from the initiator or
 *       advertiser leading to the connection.
 *
 * @retval ::NRF_SUCCESS Successfully changed the transmit power.
 * @retval ::NRF_ERROR_INVALID_PARAM Invalid parameter(s) supplied.
 * @retval ::BLE_ERROR_INVALID_ADV_HANDLE Advertising handle not found.
 * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid connection handle supplied.
 */
SVCALL(SD_BLE_GAP_TX_POWER_SET, uint32_t, sd_ble_gap_tx_power_set(uint8_t role, uint16_t handle, int8_t tx_power));

RE: How to reduce the bluetooth range in nrf52840.

Hit — Wed, 20 Feb 2019 05:54:49 GMT

I am using it for Mesh network with S140 Softdevice, how can I set tx_power?

RE: How to reduce the bluetooth range in nrf52840.

awneil — Tue, 19 Feb 2019 18:54:32 GMT

Reduce the Tx power ?

devzone.nordicsemi.com/.../just-set-tx-power