I have Service UUID and its only two characteristics UUID which is Tx (App to BLE) and Rx(BLE device to APP) on iOS App. Unable to get Data from command.

[Abhay Singh Naurang]

I have one Service UUID and its only two characteristics UUID which is Tx (App to BLE) and Rx(BLE device to APP) to get different type of data e.g. Heart rate, Sleep data, motion data etc. . Unable to get Data from command. Protocol identification mark is 0xA9

There is BLE communication protocol as following Byte1 (Protocol Command Identification Mark) Byte2 (Command) Byte3 (Serial number)
Byte4 (Data length)
Byte5..ByteN (Data content)
ByteN+1 (CRC)

And Command Description for example Heart Rate Data Request 0x26 Heart Rate Data Returned 0x27

So, I am able to connect with smart BLE device.

1. Able get its service UUID.
2. Able get Service Characteristics Type Tx UUID (write and writeWithoutResponse) and Rx UUID (notify).

But I am unable to understand how to get Data for Heart Rate from BLE Device.

If I am only trying to read Rx UUID data value is not getting for Heart Rate.

How to get Data for different commands.

I have few things to clarification as following

1. Reference bracelet increase B80-087
2. Modify the protocol heart rate,increase blood pressure, oxygen two bits, since these two value are worth to a heart rate, heart rate so that along with the upload. This is currently dedicated to the two-bit B80-87 device.

Commands are as following

1. Heart rate data request is 0x26
2. Heart rate data returned is 0x27

And Data Format Description are as following

1. [phone] heart rate data request ---> Equipment

Byte4 has Length 0

2. [Heart] set up automatic test phone ----> Equipment

Byte4 (Length : 6) , Byte5(Measurement enable: 1 turn, 0 Close), Byte6 (Starting time: Time), Byte7(Starting time: Minute), Byte8(End Time: time), Byte9(End Time: Minute),Byte10(Measurement Interval in minutes A multiple of 10).

3. [Return] heart rate data devices --> phone

Byte4(Length: 4+3*N), Byte5(Year), Byte6(Month),Byte7(day),Byte8(Number of heart rate data),Byte9(Time),Byte10(Minute),Byte11(Heart rate values) and optionals are Byte12(Blood pressure),Byte13(Blood oxygen value)

Heart rate data(data group 1..N)

(Dedicated to B80-087) Byte9(Time),Byte10(Minute),Byte11(Heart rate values) and optionals are Byte12(Blood pressure),Byte13(Blood oxygen value) Heart rate data(data group 1..N)

4. Heart rate data to respond to phone ----> Equipment Byte4 (Length:1),Byte5(0: successfully received 1:reception failed).

Note: Heat rate and heart rate data in response to the return instruction data consistent

[Petter Myhre]

Could you explain a bit more? What app are you using on iOS? Have you tested with other centrals? Windows? Android? Are you using an example from our SDK? Which? Have you modified it? Which version of our SDK are you using? What hardware? nRF51? nRF52?

[Abhay Singh Naurang]

I have actually tested my BLE device with nRF Connect and Its connect and discover one service UUID and it's characteristic UUIDs one is write and write without response UUID and other is notify UUID. I am unable to understand how i'll read heart rate data from these UUIDs.

[Petter Myhre]

According to the Heart Rate Service specification the heart rate measurement characteristic should not support read, but only notifiy. See this.

[Abhay Singh Naurang]

@Petter Myhre , I have updated question it may helpful to you understand. And Multiple command as Heart rate given for example sleep data request 0x22 and sleep data returned 0x23 etc. using only to characteristic UUIDs.

[Petter Myhre]

I don't understand. Are you still trying to read? It is not supported. It must be notified. Do you understand?