串口傳輸服務(wù)

串行傳輸服務(wù)允許用戶通過 BLE 簡單快速地傳輸串行數(shù)據(jù)。

服務(wù) UUID 是 7369666c-695f-7364-0000-0000000000000。 它有兩個(gè)特點(diǎn)：

• 串口傳輸配置：UUID 7369666c-695f-7364-0001-0000000000000（須通知）。
• 串口傳輸數(shù)據(jù)：UUID 7369666c-695f-7364-0002-0000000000000（可讀可寫可通知）

尚未使用配置特性。

數(shù)據(jù)特性用于傳輸串行數(shù)據(jù)。 其數(shù)據(jù)格式為：

• CateID, is categoryID for differernt users.
• Flag, is for fragmentation.
  • 0x00: Completed packet.
  • 0x01: First packet.
  • 0x02: Continue packet.
  • 0x03: Last packet.
• Length Packet length, is only available when flag equal 0x00;
• Data, is serial data.

實(shí)現(xiàn)傳輸串行數(shù)據(jù)

用戶只需與客戶端協(xié)商確認(rèn) categoryID 并確保該 ID 與設(shè)備中的其他用戶不同。 然后就可以傳輸數(shù)據(jù)了。

有關(guān)串行傳輸 API 的詳細(xì)信息，請參閱 Serial transmission service 。

這是示例代碼：

// Make sure the cagegoryID is different with other IDs in local.
#define APP_BLE_SERIAL_ID 0x1F
 
// Handle data from client.
void ble_app_serial_callback(uint8_t conn_idx, ble_serial_tran_data_t *data)
{
    int ret;
    ble_serial_tran_data_t send_data;
    uint8_t test_data[] = {0x01, 0x02, 0x03, 0x04};
    // The cateID should be same as registerdID APP_BLE_SERIAL_ID.
    LOG_I("cateID(%d), data(%d) %s\r\n", data->cateID, data->len, data->data);
    // Handle data from peer device start.
    
    // Handle data from peer device end.
    
    // Prepare send data to client
    send_data.cateID = APP_BLE_SERIAL_ID;
    send_data.len = sizeof(test_data);
    send_data.data = test_data;
    ret = ble_serial_tran_send_data(conn_idx, &send_data);
    LOG_I("result %d",ret);
}
 
// Register user defined cagegoryID and assoicated callback.
BLE_SERIAL_TRAN_EXPORT(APP_BLE_SERIAL_ID, ble_app_serial_callback);