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Bluetooth Data Transmission and Reception (BLE, SPP)

To send data to a mobile phone via Bluetooth, you can use either the BLE or SPP protocol.

BLE (Bluetooth Low Energy)​

The main interfaces are located in apps\common\third_party_profile\jieli\JL_rcsp\bt_trans_data\le_rcsp_adv_module.c. The key functions to pay attention to are:

  • att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size): Used to control the execution of different functions when different Characteristics are enabled. Enabling notifications for ae03 (ATT_CHARACTERISTIC_ae03_01_CLIENT_CONFIGURATION_HANDLE) will start PCA compression, while enabling notifications for ae04 (ATT_CHARACTERISTIC_ae04_01_CLIENT_CONFIGURATION_HANDLE) will start OPUS compression.
  • test_data_send_packet(void): Used to continuously send BLE notification data. The specific content of PCA and OPUS data transmission is described in detail in this function.

SPP (Serial Port Profile)​

The main interfaces are located in apps\common\third_party_profile\jieli\online_db\spp_online_db.c. Before use, you need to enable the macro APP_ONLINE_DEBUG in apps\earphone\board\br28\board_jl7016g_hybrid_cfg.h. The key functions to pay attention to are:

  • online_spp_init(void): Initializes SPP.
  • online_spp_send_data(u8 *data, u16 len): Sends SPP data packets.