如何在iOS上使用BLE（藍牙低功耗）從人體秤以CBPeripheral形式獲取數據

Question

我剛開始使用藍牙，想通過藍牙從體重秤（型號：adeVital Analysis BA 1401）讀取身體成分測量值。

將iPhone設置為Central並將其連接到電子秤（即CBPeripheral）時，我可以讀取電子秤的設備信息，例如硬件修訂號，制造商等。但是我無法獲得實際的測量數據。

我遍歷了所有服務和特性並設置了通知標志。

[peripheral setNotifyValue:YES forCharacteristic:aCharacteristic]

對於每個特征。 和委托方法

- (void) peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {

被正確調用。 當我檢查更新的外圍設備時，我發現：

<CBCharacteristic: 0x1740949b0, UUID = 8A82, properties = 0x20, value = <a1014711 f3000000 00000000 00000000 00000000>, notifying = YES>

這一切都在秤打開時發生（尚未測量任何東西）。 現在，當我踩秤並完成測量時，它會顯示一個藍牙圖標，指示數據傳輸，但是iOS應用程序未收到任何通知。 我想念什么？

總結如下：外設連接到中央並在測量之前更新特性，但是此后，不再發出通知。

更新后的CBCharacteristic中的值是否可以是我必須以某種方式訂閱以獲取實際數據的服務的UUID？

希望有人可以幫助我

編輯：

可能相關，以下是我收到的服務和特性：

Services:
"<CBService: 0x17407dc40, isPrimary = YES, UUID = Device Information>",
"<CBService: 0x174070f80, isPrimary = YES, UUID = 7802>"

Characteristics
"<CBCharacteristic: 0x1740959a0, UUID = Serial Number String, properties = 0x2, value = (null), notifying = NO>",
"<CBCharacteristic: 0x174095900, UUID = Hardware Revision String, properties = 0x2, value = (null), notifying = NO>",
"<CBCharacteristic: 0x1740952c0, UUID = Firmware Revision String, properties = 0x2, value = (null), notifying = NO>",
"<CBCharacteristic: 0x1740958b0, UUID = Manufacturer Name String, properties = 0x2, value = (null), notifying = NO>",
"<CBCharacteristic: 0x174095860, UUID = Software Revision String, properties = 0x2, value = (null), notifying = NO>"

"<CBCharacteristic: 0x170095ea0, UUID = 8A21, properties = 0x20, value = (null), notifying = NO>",
"<CBCharacteristic: 0x170095e50, UUID = 8A22, properties = 0x20, value = (null), notifying = NO>",
"<CBCharacteristic: 0x1700952c0, UUID = 8A20, properties = 0x2, value = (null), notifying = NO>",
"<CBCharacteristic: 0x170095e00, UUID = 8A81, properties = 0x8, value = (null), notifying = NO>",
"<CBCharacteristic: 0x170095db0, UUID = 8A82, properties = 0x20, value = (null), notifying = NO>"

編輯2：

CBCharacteristics具有以下屬性：

8A20 = Read
8A21 = Indicate
8A22 = Indicate
8A81 = Write
8A82 = Indicate

所有其他屬性均為BOOL NO

當我打開有關8A21、8A22和8A82的通知時，我一開始就從8A82收到了一個N​​SData，打開了比例尺（因此該點不能作為測量值）。 我假設實際測量數據正在通過8A21特性進行更新。 但是它不會通知我的代表，我也不知道為什么。

查看系統日志，您可以看到制造商的官方應用程序將日志溢出，如下所示：

Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = receive push data(<a1018b3b 02000000 00000000 00000000 00000000>),with command(a1), from characteristic(8A82)
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = receive randomnumber (37456641)
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = next step is :operating_receive_random_number
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = next step is :operating_write_xor_results
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command with data:<200eff57 c5>
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command data((null)) to characteristic(8A81)
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write success with status - operating_write_xor_results
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = next step is :operating_write_utc_time
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command with data:<02033b8b 0b>
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command data((null)) to characteristic(8A81)
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write success with status - operating_write_utc_time
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = next step is :operating_write_disconnect
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command with data:<22>
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write command data((null)) to characteristic(8A81)
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = write success with status - operating_write_disconnect
Feb 20 14:19:49 i6S lifesensehealth1_1[4163]: message = next step is :operating_uploaded_results_process

Answer 1

您需要首先將某些數據寫入特定的特征。 在我的情況下，該特性是8A81 我編寫了一個UTC時間代碼的字節數組，該代碼是通過無法在此處發布的算法生成的。 嘗試向其中寫入任何5字節長的數組/字符，看看會發生什么（例如： [1,1,1,1,1] ）