Review of Run App

You are reading a single comment by @Fteacher and its replies. Click here to read the full conversation.

•

Fteacher

@GrandVizierOlaf , @Gordon , @Mi I just did the test with a 2 minutes break. The id stayed the same, but "rssi" and manufacturerData" changed (I have no clue what these are but I mention it in case it could be interesting for something else)
( [], [data1], [], [data2])
data1 [
BluetoothDevice: {

"id": "a0:9e:1a:57:52:2b public",
"rssi": -54,
"data": new Uint8Array([19, 9, 80, 111, 108, 97, 114, 32, 79, 72, 49, 32, 53, 55, 53, 50, 50, 66, 50, 69]).buffer,
"manufacturer": 107,
"manufacturerData": new Uint8Array([114, 8, 150, 214, 167, 2, 0, 0, 0, 0, 122, 1, 5, 35, 0, 56]).buffer,
"services": [
  "180d",
  "feee"
 ],
"name": "Polar OH1 57522B2E"

}
]
data2 [
BluetoothDevice: {

"id": "a0:9e:1a:57:52:2b public",
"rssi": -51,
"data": new Uint8Array([19, 9, 80, 111, 108, 97, 114, 32, 79, 72, 49, 32, 53, 55, 53, 50, 50, 66, 50, 69]).buffer,
"manufacturer": 107,
"manufacturerData": new Uint8Array([114, 8, 150, 214, 167, 2, 0, 0, 0, 0, 122, 1, 5, 39, 0, 59]).buffer,
"services": [
  "180d",
  "feee"
 ],
"name": "Polar OH1 57522B2E"

}
]

•

Mi in reply to @Fteacher

Thats interesting. Do we know who gets public and who random addresses?
Is that device type dependent (so do all H10 have random?) or configured when cloud connected?

[rssi = Received Signal Strength Indicator, so change is to be expected here due to distance difference.]
•

GrandVizierOlaf in reply to @Fteacher

Wonderful, thanks! To add to what @Mi said, the manufacturerData is your actual health data. Without looking up the spec I would assume that a large part of it is the PPG data and it ends with your HR, the 59. For the curious, you can also pick out how the name is encoded in the data section;

19=read 19 bytes with the next byte explaining the section
9=what follows in the other 18 bytes name of the device
80=P
111=o
108=l
etc

@Mi, the id scheme is up to the manufacturer, but follows a spec. This is the summary that made the most sense to me. Given that the H10 rerandomizes after pulling the battery I was a little concerned that the OH1 might do the same after a power cycle or be of a type that expects bonding (given that BTHRM was connecting by name before and that wouldn't be changing), but that is not the case given @Fteacher's data. It might have a method to factory reset the device which would cause it to rerandomize, but that is fortunately not our concern.

Review of Run App

About

Espruino