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[经验]

【益登科技 Silicon Labs SLWSTK6021A开发板试用体验】温度ClientBLE 主从测试

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SoC-温度计客户端
此示例应用程序演示了在多从BLE拓扑中客户端设备的操作。Silicon Labs蓝牙协议栈支持同时连接最多8个从设备。这个示例应用程序演示了如何同时连接到四个温度计外围设备。
11.png
需要一个运行SoC温度计客户端示例应用程序的EFR32/BGM设备，以及至少一个（但不超过四个）运行SoC温度计应用程序的外围设备。下图显示了测试此示例应用程序的拓扑设置。
网络拓扑
当客户端启动时，它开始搜索/发现广告设备。它启动与那些在其广告包中包含健康温度计服务的设备的连接。
建立连接后，客户机从远程GATT数据库中发现健康温度计服务。服务发现完成后，客户机发现温度计特性并启用从远程GATT服务器发送的指示。
对设备进行编程后，打开终端仿真器并通过其串行端口连接到客户端设备。将波特率设置为115200。打开从属温度计设备的电源，观察终端上的输出读数。
四个外围设备的温度读数
22.png

  1. void sl_bt_on_event(sl_bt_msg_t* evt)
  2. {
  3.   sl_status_t sc;
  4.   uint8_t *char_value;
  5.   uint16_t addr_value;
  6.   uint8_t table_index;

  8.   // Handle stack events
  9.   switch (SL_BT_MSG_ID(evt->header)) {
  10.     // -------------------------------
  11.     // This event indicates the device has started and the radio is ready.
  12.     // Do not call any stack command before receiving this boot event!
  13.     case sl_bt_evt_system_boot_id:
  14.       // Print boot message.
  15.       app_log_info("Bluetooth stack booted: v%d.%d.%d-b%d
  16. ",
  17.                    evt->data.evt_system_boot.major,
  18.                    evt->data.evt_system_boot.minor,
  19.                    evt->data.evt_system_boot.patch,
  20.                    evt->data.evt_system_boot.build);
  21.       // Print bluetooth address.
  22.       print_bluetooth_address();
  23.       // Set passive scanning on 1Mb PHY
  24.       sc = sl_bt_scanner_set_mode(sl_bt_gap_1m_phy, SCAN_PASSIVE);
  25.       app_assert_status(sc);
  26.       // Set scan interval and scan window
  27.       sc = sl_bt_scanner_set_timing(sl_bt_gap_1m_phy, SCAN_INTERVAL, SCAN_WINDOW);
  28.       app_assert_status(sc);
  29.       // Set the default connection parameters for subsequent connections
  30.       sc = sl_bt_connection_set_default_parameters(CONN_INTERVAL_MIN,
  31.                                                    CONN_INTERVAL_MAX,
  32.                                                    CONN_RESPONDER_LATENCY,
  33.                                                    CONN_TIMEOUT,
  34.                                                    CONN_MIN_CE_LENGTH,
  35.                                                    CONN_MAX_CE_LENGTH);
  36.       app_assert_status(sc);
  37.       // Start scanning - looking for thermometer devices
  38.       sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
  39.       app_assert_status_f(sc,
  40.                           "Failed to start discovery #1
  41. ");
  42.       conn_state = scanning;
  43.       break;

  45.     // -------------------------------
  46.     // This event is generated when an advertisement packet or a scan response
  47.     // is received from a responder
  48.     case sl_bt_evt_scanner_scan_report_id:
  49.       // Parse advertisement packets
  50.       if (evt->data.evt_scanner_scan_report.packet_type == 0) {
  51.         // If a thermometer advertisement is found...
  52.         if (find_service_in_advertisement(&(evt->data.evt_scanner_scan_report.data.data[0]),
  53.                                           evt->data.evt_scanner_scan_report.data.len) != 0) {
  54.           // then stop scanning for a while
  55.           sc = sl_bt_scanner_stop();
  56.           app_assert_status(sc);
  57.           // and connect to that device
  58.           if (active_connections_num < SL_BT_CONFIG_MAX_CONNECTIONS) {
  59.             sc = sl_bt_connection_open(evt->data.evt_scanner_scan_report.address,
  60.                                        evt->data.evt_scanner_scan_report.address_type,
  61.                                        sl_bt_gap_1m_phy,
  62.                                        NULL);
  63.             app_assert_status(sc);
  64.             conn_state = opening;
  65.           }
  66.         }
  67.       }
  68.       break;

  70.     // -------------------------------
  71.     // This event is generated when a new connection is established
  72.     case sl_bt_evt_connection_opened_id:
  73.       // Get last two bytes of sender address
  74.       addr_value = (uint16_t)(evt->data.evt_connection_opened.address.addr[1] << 8) + evt->data.evt_connection_opened.address.addr[0];
  75.       // Add connection to the connection_properties array
  76.       add_connection(evt->data.evt_connection_opened.connection, addr_value);
  77.       // Discover Health Thermometer service on the responder device
  78.       sc = sl_bt_gatt_discover_primary_services_by_uuid(evt->data.evt_connection_opened.connection,
  79.                                                         sizeof(thermo_service),
  80.                                                         (const uint8_t*)thermo_service);
  81.       app_assert_status(sc);

  83.       // Set remote connection power reporting - needed for Power Control
  84.       sc = sl_bt_connection_set_remote_power_reporting(
  85.         evt->data.evt_connection_opened.connection,
  86.         sl_bt_connection_power_reporting_enable);
  87.       app_assert_status(sc);

  89.       conn_state = discover_services;
  90.       break;

  92.     // -------------------------------
  93.     // This event is generated when a new service is discovered
  94.     case sl_bt_evt_gatt_service_id:
  95.       table_index = find_index_by_connection_handle(evt->data.evt_gatt_service.connection);
  96.       if (table_index != TABLE_INDEX_INVALID) {
  97.         // Save service handle for future reference
  98.         conn_properties[table_index].thermometer_service_handle = evt->data.evt_gatt_service.service;
  99.       }
  100.       break;

  102.     // -------------------------------
  103.     // This event is generated when a new characteristic is discovered
  104.     case sl_bt_evt_gatt_characteristic_id:
  105.       table_index = find_index_by_connection_handle(evt->data.evt_gatt_characteristic.connection);
  106.       if (table_index != TABLE_INDEX_INVALID) {
  107.         // Save characteristic handle for future reference
  108.         conn_properties[table_index].thermometer_characteristic_handle = evt->data.evt_gatt_characteristic.characteristic;
  109.       }
  110.       break;

  112.     // -------------------------------
  113.     // This event is generated for various procedure completions, e.g. when a
  114.     // write procedure is completed, or service discovery is completed
  115.     case sl_bt_evt_gatt_procedure_completed_id:
  116.       table_index = find_index_by_connection_handle(evt->data.evt_gatt_procedure_completed.connection);
  117.       if (table_index == TABLE_INDEX_INVALID) {
  118.         break;
  119.       }
  120.       // If service discovery finished
  121.       if (conn_state == discover_services && conn_properties[table_index].thermometer_service_handle != SERVICE_HANDLE_INVALID) {
  122.         // Discover thermometer characteristic on the responder device
  123.         sc = sl_bt_gatt_discover_characteristics_by_uuid(evt->data.evt_gatt_procedure_completed.connection,
  124.                                                          conn_properties[table_index].thermometer_service_handle,
  125.                                                          sizeof(thermo_char),
  126.                                                          (const uint8_t*)thermo_char);
  127.         app_assert_status(sc);
  128.         conn_state = discover_characteristics;
  129.         break;
  130.       }
  131.       // If characteristic discovery finished
  132.       if (conn_state == discover_characteristics && conn_properties[table_index].thermometer_characteristic_handle != CHARACTERISTIC_HANDLE_INVALID) {
  133.         // stop discovering
  134.         sl_bt_scanner_stop();
  135.         // enable indications
  136.         sc = sl_bt_gatt_set_characteristic_notification(evt->data.evt_gatt_procedure_completed.connection,
  137.                                                         conn_properties[table_index].thermometer_characteristic_handle,
  138.                                                         sl_bt_gatt_indication);
  139.         app_assert_status(sc);
  140.         conn_state = enable_indication;
  141.         break;
  142.       }
  143.       // If indication enable process finished
  144.       if (conn_state == enable_indication) {
  145.         // and we can connect to more devices
  146.         if (active_connections_num < SL_BT_CONFIG_MAX_CONNECTIONS) {
  147.           // start scanning again to find new devices
  148.           sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
  149.           app_assert_status_f(sc,
  150.                               "Failed to start discovery #2
  151. ");
  152.           conn_state = scanning;
  153.         } else {
  154.           conn_state = running;
  155.         }
  156.         break;
  157.       }
  158.       break;

  160.     // -------------------------------
  161.     // This event is generated when a connection is dropped
  162.     case sl_bt_evt_connection_closed_id:
  163.       // remove connection from active connections
  164.       remove_connection(evt->data.evt_connection_closed.connection);
  165.       if (conn_state != scanning) {
  166.         // start scanning again to find new devices
  167.         sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
  168.         app_assert_status_f(sc,
  169.                             "Failed to start discovery #3
  170. ");
  171.         conn_state = scanning;
  172.       }
  173.       break;

  175.     // -------------------------------
  176.     // This event is generated when a characteristic value was received e.g. an indication
  177.     case sl_bt_evt_gatt_characteristic_value_id:
  178.       if (evt->data.evt_gatt_characteristic_value.value.len >= 5) {
  179.         char_value = &(evt->data.evt_gatt_characteristic_value.value.data[0]);
  180.         table_index = find_index_by_connection_handle(evt->data.evt_gatt_characteristic_value.connection);
  181.         if (table_index != TABLE_INDEX_INVALID) {
  182.           conn_properties[table_index].temperature = translate_IEEE_11073_temperature_to_float((IEEE_11073_float *)(char_value + 1));
  183.           conn_properties[table_index].unit = translate_flags_to_temperature_unit(char_value[0]);
  184.         }
  185.       } else {
  186.         app_log_warning("Characteristic value too short: %d
  187. ",
  188.                         evt->data.evt_gatt_characteristic_value.value.len);
  189.       }
  190.       // Send confirmation for the indication
  191.       sc = sl_bt_gatt_send_characteristic_confirmation(evt->data.evt_gatt_characteristic_value.connection);
  192.       app_assert_status(sc);
  193.       // Trigger RSSI measurement on the connection
  194.       sc = sl_bt_connection_get_rssi(evt->data.evt_gatt_characteristic_value.connection);
  195.       app_assert_status(sc);
  196.       break;

  198.     // -------------------------------
  199.     // This event is generated when RSSI value was measured
  200.     case sl_bt_evt_connection_rssi_id:
  201.       table_index = find_index_by_connection_handle(evt->data.evt_connection_rssi.connection);
  202.       if (table_index != TABLE_INDEX_INVALID) {
  203.         conn_properties[table_index].rssi = evt->data.evt_connection_rssi.rssi;
  204.       }

  206.       print_values();
  207.       break;

  209.     // -------------------------------
  210.     // TX Power is updated
  211.     case sl_bt_evt_connection_tx_power_id:

  213.       table_index = find_index_by_connection_handle(
  214.         evt->data.evt_connection_tx_power.connection);

  216.       if (table_index != TABLE_INDEX_INVALID) {
  217.         conn_properties[table_index].tx_power =
  218.           evt->data.evt_connection_tx_power.power_level;
  219.       }

  221.       // TX Power reporting is enabled on the other side.
  222.       conn_properties[table_index].power_control_active =
  223.         TX_POWER_CONTROL_ACTIVE;
  224.       break;

  226.     // -------------------------------
  227.     // Remote TX Power is updated
  228.     case sl_bt_evt_connection_remote_tx_power_id:
  229.       table_index = find_index_by_connection_handle(
  230.         evt->data.evt_connection_remote_tx_power.connection);

  232.       if (table_index != TABLE_INDEX_INVALID) {
  233.         conn_properties[table_index].remote_tx_power =
  234.           evt->data.evt_connection_remote_tx_power.power_level;
  235.       }
  236.       break;

  238.     default:
  239.       break;
  240.   }
  241. }





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