Android Question Polar H7 Data

[postasat]

Hi,
I need to extract data from polar H7 heart rate monitor.

I need Heart rate measurement and battery level.

I found some code (from polar) for ios here:
http://developer.polar.com/wiki/H6_and_H7_Heart_rate_sensors

Somebody knows how to get this two type of data ?

Thank you.

 

[Erel]

Start with listing all the services and charateristics as done in the example: https://www.b4x.com/android/forum/threads/ble-2-bluetooth-low-energy.59937/#content

What are the outputs?

 

[postasat]

Using the BLE example I have in the log:

Found: Polar H7 973F1515, 00:22:D0:97:3F:15, RSSI = -58, (MyMap) {1=[B@421d90d0, -1=[B@421d9138, 9=[B@421d9180}

Follow a link with an image reporting the data in the customlistview.
https://www.dropbox.com/s/oefyulhy276kz89/data.png?dl=0

Thank you

 

[Erel]

The list shows you the services and characteristics tree. You need to find the ones that you are interested in and read them.

The characteristics are described here: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicsHome.aspx

For example: 00002a38-0000-1000-8000-00805f9b34fb => (2A38) Body Sensor Location

 

[postasat]

Thank you Erel,

now I can read battery level.

Heart Rate measurement (2A37) is still not available.

I should activate the "notify" status on Polar H7, to get the real time heart rate data.

Notify has to be turned on by changing the Characteristic Configuration at handle 0x0012 i.e. UUID 0x2902.
The data returned is from handle 0x0011 i.e. UUID 0x2a37 which is the characteristic that provides Heart Rate Measurement.

Can you give me an example how to write data on polar using BLE example to activate notify, and how to read 0x2a37 every seconds ?

 

[DonManfred]

now I can read battery level.

https://www.b4x.com/android/help/phone.html#phoneevents

 

[Johan Schoeman]

https://www.b4x.com/android/help/phone.html#phoneevents

No, it is the battery level of the Polar - not the phone...

 

[Erel]

You can use Manager.SetNotify to starting listening for notifications.

 

[postasat]

You're right,
it's the Polar battery level.

I can read the data about battery level, it's the value of characteristic 0x2a19.

Now I need to have the heart rate measurement data.
The heart rate measurement is not available in a normal data reading.
I think that must be activate.
After activation, Polar HRM should send every second the data, as notify.
I need an example how to write data on polar to activate notify, and how to read 0x2a37 notify, every seconds.

Thank you.

 

[Erel]

See my answer above. You just need to call SetNotify with the correct service and characteristic. The DataAvailable event will be raised whenever there is a notification.

 

[postasat]

I activate manager.SetNotify for the service 180d and the characteristic 0x2a37 (after a standard read data of all characteristics).

manager.ReadData2("0000180d-0000-1000-8000-00805f9b34fb","00002a37-0000-1000-8000-00805f9b34fb")

The log return "No matching characteristic found".
In the service 180d I can only read the characteristic 0x2a38 (Body Sensor Location).
I think that Notify has to be turned on (on Polar), but I'm not sure.
The Polar example for ios set this.
#define HEART_RATE_SERVICE @"180D"
#define HEART_RATE_MEASUREMENT @"2A37"

The Polar example for ios how to read heart rate measurement data is not so clear (for me).
http://developer.polar.com/wiki/H6_and_H7_Heart_rate_sensors
Seems that they don't send nothing to start notify.
I'm lost...

Thank you.

 

[Erel]

You cannot call ReadData2 to read this characteristic. Have you tried to call SetNotify?

 

[postasat]

I tried to call SetNotify with the following code (I put it in starter, activated with a button in "Main").

manager.SetNotify("0000180d-0000-1000-8000-00805f9b34fb","00002a37-0000-1000-8000-00805f9b34fb",True)

After activated this command nothing happen, DataAvailable event is never raised.

Maybe I misunderstanding the use of SetNotify command and how to read the notify from Polar, can you give me some example ?

 

[Johan Schoeman]

I tried to call SetNotify with the following code (I put it in starter, activated with a button in "Main").

manager.SetNotify("0000180d-0000-1000-8000-00805f9b34fb","00002a37-0000-1000-8000-00805f9b34fb",True)

After activated this command nothing happen, DataAvailable event is never raised.

Maybe I misunderstanding the use of SetNotify command and how to read the notify from Polar, can you give me some example ?

Are you using the latest update of the library? See this post....just in case...
https://www.b4x.com/android/forum/threads/ble2-setnotify.62042/#post-392018

 

[postasat]

With the new library update SetNotify is Ok.
Polar transmitt HR data every seconds and I can read it.

If can help somebody else, the code I added on DataAvailable is the following:

'Measure
If keyread = "00002a37-0000-1000-8000-00805f9b34fb" Then
   testoconvhrm = conv.HexFromBytes(Characteristics.GetValueAt(i))
end if

byte2 = testoconvhrm.CharAt(2)
byte3 = testoconvhrm.CharAt(3)
   
Dim realhr As Int
Dim bpm As String
bpm = byte2 & byte3
realhr = Bit.ParseInt(bpm, 16)

Log("HEART RATE: " & realhr)

To start notify I put in Starter the following code, that I activate with a button from Main:

Public Sub writeData1
    'Enable
    manager.SetNotify("0000180d-0000-1000-8000-00805f9b34fb","00002a37-0000-1000-8000-00805f9b34fb",True)
    Log("Set Notify")
End Sub

To stop notify I put in Starter the following code, that I activate with a button from Main:

Public Sub writeData2
    'Disable
    manager.SetNotify("0000180d-0000-1000-8000-00805f9b34fb","00002a37-0000-1000-8000-00805f9b34fb",False)
    Log("UnSet Notify")
End Sub

Thanks to everybody !!!

 

[Denny Hopp]

Does anyone have example code using the BLE2 WriteData to write data to a BLE device? My reads are working fine but the writes don't work. Thanks!

 

[Erel]

Please start a new thread for this question. Also post the code that is not working for you.