Hi
I used the SDK 14.2, and download the android source code from guthub. Because I sent many packets(about 100 packets), so the delay should be set in the Android. I tried from 5ms ~ 20ms, and 20ms is ok and none packet lost. If I used 20ms delay, the communication was very slow. I will list some code of Android and SDK 14.2 paraments.
Android
btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
byte[] value = new byte[20];//BLE send array
........
mService.writeRXCharacteristic(value);//write to BLE
try {
Thread.sleep(20);//delay 20ms
} catch (InterruptedException e) {
}
In SDK 14.2, BLE paraments is as following:
#define APP_BLE_OBSERVER_PRIO 3 /**< Application's BLE observer priority. You shouldn't need to modify this value. */
#define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */
#define APP_ADV_INTERVAL 64*25*1 /**< The advertising interval (in units of 0.625 ms; this value corresponds to 40 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED /**< The advertising time-out (in units of seconds). When set to 0, we will never time out. */
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(50, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(80, UNIT_1_25_MS) /**< Maximum acceptable connection interval (1 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory time-out (4 seconds). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(20000) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (15 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000) /**< 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 BUTTON_DETECTION_DELAY APP_TIMER_TICKS(50) /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */
#define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
So, could you give me some advice? Thanks!
