Tunning connection parameters to minimize current consumption for a fitness device transmitting data to ANT+ and BLE at 1sec intervals. The desire is timeout after 60sec advertising. Formula to calculate values for a 30sec advertising timeout?
My question which is what rules should be followed to meet the above objective?
Please see example advertising and pairing connection parameters below.
ADVERTISING CONNECTION PARAMETERS
#define APP_CFG_NON_CONN_ADV_TIMEOUT 30 /**< Time for which the device must be advertising in non-connectable mode (in seconds). */
#define APP_CFG_CHAR_NOTIF_TIMEOUT 5000 /**< Time for which the device must continue to send notifications once connected to central (in milliseconds). */
#define APP_CFG_ADV_DATA_LEN 31 /**< Required length of the complete advertisement packet. This should be atleast 8 in order to accommodate flag field and other mandatory fields and one byte of manufacturer specific data. */
#define APP_CFG_CONNECTION_INTERVAL 20 /**< Connection interval used by the central (in milli seconds). This application will be sending one notification per connection interval. A repeating timer will be started with timeout value equal to this value and one notification will be sent everytime this timer expires. */
#define APP_CFG_CHAR_LEN 20 /**< Size of the characteristic value being notified (in bytes). */
#define APP_ADV_INTERVAL MSEC_TO_UNITS(20, UNIT_0_625_MS) /**< The advertising interval for connectable advertisement (20 ms). This value can vary between 20ms to 10.24s. */
#define APP_ADV_TIMEOUT_IN_SECONDS 60
PAIRING CONNECTION PARAMETERS
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(10, UNIT_1_25_MS) //16 /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(500, UNIT_1_25_MS) //60 /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY 5 /**< slave latency. */
#define CONN_SUP_TIMEOUT 400 /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(20000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (20 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (5 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */
#define ANT_CLOSE_CHANNEL_INTVL APP_TIMER_TICKS(60000, APP_TIMER_PRESCALER) //ANT close channel timer
#define SEC_PARAM_TIMEOUT 30 /**< Timeout for Pairing Request or Security Request (in seconds). */
#define SEC_PARAM_BOND 1 /**< Perform bonding. */
#define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */
#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */
#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */
