two slave, data, overlapped

[lyman]

i am using this project:

\nRF5_SDK_14.2.0_17b948a\examples\ble_central\ble_app_uart_c\main.c as center.

nRF5_SDK_14.2.0_17b948a\examples\ble_peripheral\ble_app_uart\main.c as slave.

i have two slave ,the data flow is this :

slave(two slave  air) -->center -( physical serial)---->andorid board -- >display screen 

the two slave send button state and position data to center.

if i use only one slave, data is all ok

but if i connect two slave. sometimes i miss one of slaves 's button press message 

and sometimes i found the position data is overlapped.

for example slave a send;    i am jam;

slave b send:  i am cherry 

when two slave is connected with center, the display screen show : i am  i am cherry 

i think slave a's data is interruped by slave b's data or may be some buffer is overflow,slave a's data is overwrite.

how can i fix this ???

[Marjeris Romero]

Hi lyman,

The ble_app_uart examples does not implement support for multilink. You will have to study the multilink central and multiperipheral examples, and transfer the principles used there to the NUS examples.

Best Regards,

Marjeris

[lyman]

i have defined more instance, it works well .the only problem is i missed some data when two slave connect.

BLE_NUS_C_DEF(m_ble_nus_c); /**< BLE NUS service client instance. */
BLE_NUS_C_DEF(m_ble_nus_c1);
BLE_NUS_C_DEF(m_ble_nus_c2);
BLE_NUS_C_DEF(m_ble_nus_c3);

BLE_DB_DISCOVERY_DEF(m_db_disc);
BLE_DB_DISCOVERY_DEF(m_db_disc1);
BLE_DB_DISCOVERY_DEF(m_db_disc2);
BLE_DB_DISCOVERY_DEF(m_db_disc3);

in function static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)

i add the following code

if(p_ble_evt->evt.gap_evt.conn_handle == 0)
{
err_code = ble_nus_c_handles_assign(&m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);
}
if(p_ble_evt->evt.gap_evt.conn_handle == 1)
{
err_code = ble_nus_c_handles_assign(&m_ble_nus_c1, p_ble_evt->evt.gap_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);
}
if(p_ble_evt->evt.gap_evt.conn_handle == 2)
{
err_code = ble_nus_c_handles_assign(&m_ble_nus_c2, p_ble_evt->evt.gap_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);
}
if(p_ble_evt->evt.gap_evt.conn_handle == 3)
{
err_code = ble_nus_c_handles_assign(&m_ble_nus_c3, p_ble_evt->evt.gap_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);
}

if(p_ble_evt->evt.gap_evt.conn_handle == 0)
{
err_code = ble_db_discovery_start(&m_db_disc, p_ble_evt->evt.gap_evt.conn_handle);
APP_ERROR_CHECK(err_code);
}
if(p_ble_evt->evt.gap_evt.conn_handle == 1)
{
err_code = ble_db_discovery_start(&m_db_disc1, p_ble_evt->evt.gap_evt.conn_handle);
APP_ERROR_CHECK(err_code);
}

if(p_ble_evt->evt.gap_evt.conn_handle == 2)
{
err_code = ble_db_discovery_start(&m_db_disc2, p_ble_evt->evt.gap_evt.conn_handle);
APP_ERROR_CHECK(err_code);
}
if(p_ble_evt->evt.gap_evt.conn_handle == 3)
{
err_code = ble_db_discovery_start(&m_db_disc3, p_ble_evt->evt.gap_evt.conn_handle);
APP_ERROR_CHECK(err_code);
}
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);

if (ble_conn_state_n_centrals() == NRF_SDH_BLE_CENTRAL_LINK_COUNT)
{
;
}
else
{
scan_start();
}

the config's following

// <o> NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - Maximum number of peripheral links.
#ifndef NRF_SDH_BLE_PERIPHERAL_LINK_COUNT
#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 0
#endif

// <o> NRF_SDH_BLE_CENTRAL_LINK_COUNT - Maximum number of central links.
#ifndef NRF_SDH_BLE_CENTRAL_LINK_COUNT
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 4
#endif

// <o> NRF_SDH_BLE_TOTAL_LINK_COUNT - Maximum number of total concurrent connections using the default configuration.
#ifndef NRF_SDH_BLE_TOTAL_LINK_COUNT
#define NRF_SDH_BLE_TOTAL_LINK_COUNT 4
#endif

// <o> NRF_SDH_BLE_GAP_EVENT_LENGTH - The time set aside for this connection on every connection interval in 1.25 ms units.
#ifndef NRF_SDH_BLE_GAP_EVENT_LENGTH
#define NRF_SDH_BLE_GAP_EVENT_LENGTH 3
#endif

// <o> NRF_SDH_BLE_GATT_MAX_MTU_SIZE - Static maximum MTU size.
#ifndef NRF_SDH_BLE_GATT_MAX_MTU_SIZE
#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247
#endif

// <o> NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE - Attribute Table size in bytes. The size must be a multiple of 4.
#ifndef NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE
#define NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE 1408
#endif

// <o> NRF_SDH_BLE_VS_UUID_COUNT - The number of vendor-specific UUIDs.
#ifndef NRF_SDH_BLE_VS_UUID_COUNT
#define NRF_SDH_BLE_VS_UUID_COUNT 1
#endif

// <q> NRF_SDH_BLE_SERVICE_CHANGED - Include the Service Changed characteristic in the Attribute Table.

#ifndef NRF_SDH_BLE_SERVICE_CHANGED
#define NRF_SDH_BLE_SERVICE_CHANGED 0
#endif