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

仿真

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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。

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

void sl_bt_on_event(sl_bt_msg_t* evt)
{
sl_status_t sc;
uint8_t *char_value;
uint16_t addr_value;
uint8_t table_index;
// Handle stack events
switch (SL_BT_MSG_ID(evt->header)) {
// -------------------------------
// This event indicates the device has started and the radio is ready.
// Do not call any stack command before receiving this boot event!
case sl_bt_evt_system_boot_id:
// Print boot message.
app_log_info("Bluetooth stack booted: v%d.%d.%d-b%d
",
evt->data.evt_system_boot.major,
evt->data.evt_system_boot.minor,
evt->data.evt_system_boot.patch,
evt->data.evt_system_boot.build);
// Print bluetooth address.
print_bluetooth_address();
// Set passive scanning on 1Mb PHY
sc = sl_bt_scanner_set_mode(sl_bt_gap_1m_phy, SCAN_PASSIVE);
app_assert_status(sc);
// Set scan interval and scan window
sc = sl_bt_scanner_set_timing(sl_bt_gap_1m_phy, SCAN_INTERVAL, SCAN_WINDOW);
app_assert_status(sc);
// Set the default connection parameters for subsequent connections
sc = sl_bt_connection_set_default_parameters(CONN_INTERVAL_MIN,
CONN_INTERVAL_MAX,
CONN_RESPONDER_LATENCY,
CONN_TIMEOUT,
CONN_MIN_CE_LENGTH,
CONN_MAX_CE_LENGTH);
app_assert_status(sc);
// Start scanning - looking for thermometer devices
sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
app_assert_status_f(sc,
"Failed to start discovery #1
");
conn_state = scanning;
break;
// -------------------------------
// This event is generated when an advertisement packet or a scan response
// is received from a responder
case sl_bt_evt_scanner_scan_report_id:
// Parse advertisement packets
if (evt->data.evt_scanner_scan_report.packet_type == 0) {
// If a thermometer advertisement is found...
if (find_service_in_advertisement(&(evt->data.evt_scanner_scan_report.data.data[0]),
evt->data.evt_scanner_scan_report.data.len) != 0) {
// then stop scanning for a while
sc = sl_bt_scanner_stop();
app_assert_status(sc);
// and connect to that device
if (active_connections_num < SL_BT_CONFIG_MAX_CONNECTIONS) {
sc = sl_bt_connection_open(evt->data.evt_scanner_scan_report.address,
evt->data.evt_scanner_scan_report.address_type,
sl_bt_gap_1m_phy,
NULL);
app_assert_status(sc);
conn_state = opening;
}
}
}
break;
// -------------------------------
// This event is generated when a new connection is established
case sl_bt_evt_connection_opened_id:
// Get last two bytes of sender address
addr_value = (uint16_t)(evt->data.evt_connection_opened.address.addr[1] << 8) + evt->data.evt_connection_opened.address.addr[0];
// Add connection to the connection_properties array
add_connection(evt->data.evt_connection_opened.connection, addr_value);
// Discover Health Thermometer service on the responder device
sc = sl_bt_gatt_discover_primary_services_by_uuid(evt->data.evt_connection_opened.connection,
sizeof(thermo_service),
(const uint8_t*)thermo_service);
app_assert_status(sc);
// Set remote connection power reporting - needed for Power Control
sc = sl_bt_connection_set_remote_power_reporting(
evt->data.evt_connection_opened.connection,
sl_bt_connection_power_reporting_enable);
app_assert_status(sc);
conn_state = discover_services;
break;
// -------------------------------
// This event is generated when a new service is discovered
case sl_bt_evt_gatt_service_id:
table_index = find_index_by_connection_handle(evt->data.evt_gatt_service.connection);
if (table_index != TABLE_INDEX_INVALID) {
// Save service handle for future reference
conn_properties[table_index].thermometer_service_handle = evt->data.evt_gatt_service.service;
}
break;
// -------------------------------
// This event is generated when a new characteristic is discovered
case sl_bt_evt_gatt_characteristic_id:
table_index = find_index_by_connection_handle(evt->data.evt_gatt_characteristic.connection);
if (table_index != TABLE_INDEX_INVALID) {
// Save characteristic handle for future reference
conn_properties[table_index].thermometer_characteristic_handle = evt->data.evt_gatt_characteristic.characteristic;
}
break;
// -------------------------------
// This event is generated for various procedure completions, e.g. when a
// write procedure is completed, or service discovery is completed
case sl_bt_evt_gatt_procedure_completed_id:
table_index = find_index_by_connection_handle(evt->data.evt_gatt_procedure_completed.connection);
if (table_index == TABLE_INDEX_INVALID) {
break;
}
// If service discovery finished
if (conn_state == discover_services && conn_properties[table_index].thermometer_service_handle != SERVICE_HANDLE_INVALID) {
// Discover thermometer characteristic on the responder device
sc = sl_bt_gatt_discover_characteristics_by_uuid(evt->data.evt_gatt_procedure_completed.connection,
conn_properties[table_index].thermometer_service_handle,
sizeof(thermo_char),
(const uint8_t*)thermo_char);
app_assert_status(sc);
conn_state = discover_characteristics;
break;
}
// If characteristic discovery finished
if (conn_state == discover_characteristics && conn_properties[table_index].thermometer_characteristic_handle != CHARACTERISTIC_HANDLE_INVALID) {
// stop discovering
sl_bt_scanner_stop();
// enable indications
sc = sl_bt_gatt_set_characteristic_notification(evt->data.evt_gatt_procedure_completed.connection,
conn_properties[table_index].thermometer_characteristic_handle,
sl_bt_gatt_indication);
app_assert_status(sc);
conn_state = enable_indication;
break;
}
// If indication enable process finished
if (conn_state == enable_indication) {
// and we can connect to more devices
if (active_connections_num < SL_BT_CONFIG_MAX_CONNECTIONS) {
// start scanning again to find new devices
sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
app_assert_status_f(sc,
"Failed to start discovery #2
");
conn_state = scanning;
} else {
conn_state = running;
}
break;
}
break;
// -------------------------------
// This event is generated when a connection is dropped
case sl_bt_evt_connection_closed_id:
// remove connection from active connections
remove_connection(evt->data.evt_connection_closed.connection);
if (conn_state != scanning) {
// start scanning again to find new devices
sc = sl_bt_scanner_start(sl_bt_gap_1m_phy, sl_bt_scanner_discover_generic);
app_assert_status_f(sc,
"Failed to start discovery #3
");
conn_state = scanning;
}
break;
// -------------------------------
// This event is generated when a characteristic value was received e.g. an indication
case sl_bt_evt_gatt_characteristic_value_id:
if (evt->data.evt_gatt_characteristic_value.value.len >= 5) {
char_value = &(evt->data.evt_gatt_characteristic_value.value.data[0]);
table_index = find_index_by_connection_handle(evt->data.evt_gatt_characteristic_value.connection);
if (table_index != TABLE_INDEX_INVALID) {
conn_properties[table_index].temperature = translate_IEEE_11073_temperature_to_float((IEEE_11073_float *)(char_value + 1));
conn_properties[table_index].unit = translate_flags_to_temperature_unit(char_value[0]);
}
} else {
app_log_warning("Characteristic value too short: %d
",
evt->data.evt_gatt_characteristic_value.value.len);
}
// Send confirmation for the indication
sc = sl_bt_gatt_send_characteristic_confirmation(evt->data.evt_gatt_characteristic_value.connection);
app_assert_status(sc);
// Trigger RSSI measurement on the connection
sc = sl_bt_connection_get_rssi(evt->data.evt_gatt_characteristic_value.connection);
app_assert_status(sc);
break;
// -------------------------------
// This event is generated when RSSI value was measured
case sl_bt_evt_connection_rssi_id:
table_index = find_index_by_connection_handle(evt->data.evt_connection_rssi.connection);
if (table_index != TABLE_INDEX_INVALID) {
conn_properties[table_index].rssi = evt->data.evt_connection_rssi.rssi;
}
print_values();
break;
// -------------------------------
// TX Power is updated
case sl_bt_evt_connection_tx_power_id:
table_index = find_index_by_connection_handle(
evt->data.evt_connection_tx_power.connection);
if (table_index != TABLE_INDEX_INVALID) {
conn_properties[table_index].tx_power =
evt->data.evt_connection_tx_power.power_level;
}
// TX Power reporting is enabled on the other side.
conn_properties[table_index].power_control_active =
TX_POWER_CONTROL_ACTIVE;
break;
// -------------------------------
// Remote TX Power is updated
case sl_bt_evt_connection_remote_tx_power_id:
table_index = find_index_by_connection_handle(
evt->data.evt_connection_remote_tx_power.connection);
if (table_index != TABLE_INDEX_INVALID) {
conn_properties[table_index].remote_tx_power =
evt->data.evt_connection_remote_tx_power.power_level;
}
break;
default:
break;
}
}

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