send "sd_ble_gattc_write" continuously

[roger.k]

Hi. I'm using PCA10028, SDK10.0.0, S130 as central. I'm using "sd_ble_gattc_write" when i want to send string to peripheral.

But if i send this function continuously, system doesn't work.

for example,

uint32_t val;
for(int i=0;i<50;i++){
	    const ble_gattc_write_params_t write_params = {
	        .write_op = BLE_GATT_OP_WRITE_CMD,
	        .flags    = BLE_GATT_EXEC_WRITE_FLAG_PREPARED_WRITE,
	        .handle   = tx_handle,
	        .offset   = 0,
	        .len      = length,
	        .p_value  = p_string
	    };
            val=sd_ble_gattc_write(conn_handle, &write_params);
}

I need your help.

[run_ar]

The softdevice only has a given/configured number of tx buffers. You need to check the return value of sd_ble_gattc_write to see the if there are available buffers, then if it's not you need to wait for the BLE_EVT_TX_COMPLETE (for write without response) before you can send more packets. For return codes see the documentation.

[roger.k]

Thanks. Very helpful.