nRF Master Control Panel Nexus 4 Mi Band

RE: nRF Master Control Panel Nexus 4 Mi Band

Hung Bui — Thu, 23 Apr 2015 07:00:43 GMT

It shouldn't be too complicated to implement one. First you call readRemoteRssi from at BluetoothGatt instance that connected to the target BluetoothDevice. Then you wait for and catch onReadRemoteRssi call back with the BluetoothGattCallback where you can get the new rssi value.

RE: nRF Master Control Panel Nexus 4 Mi Band

muhkuhns — Wed, 22 Apr 2015 14:08:19 GMT

No I haven't, because I haven't found an application using it and can't write one on my own.

RE: nRF Master Control Panel Nexus 4 Mi Band

Hung Bui — Wed, 22 Apr 2015 13:48:49 GMT

Have you tried readRemoteRssi ?

RE: nRF Master Control Panel Nexus 4 Mi Band

muhkuhns — Wed, 22 Apr 2015 12:01:40 GMT

I am just curious: Why can we just capture the RSSI Graph from advertising packets and not while connected? Because if I ask the MiBand for its preferred connection parameters it tells me "7,5ms - 100ms" and that should be fast enough, shouldn't it?

RE: nRF Master Control Panel Nexus 4 Mi Band

Hung Bui — Wed, 22 Apr 2015 11:58:12 GMT

@muhkuhns: I think I know the problem. For some reasons (to reduce power consumption?) with Android v5.0 and Nexus' devices the scanning windows is very small and scanning interval is large. The result is that it's pretty hard to capture an advertising packet on Nexus devices unless you advertise very frequently.

In your case, I suspect the MiBand advertises with not very small advertising interval (few hundreds ms ? ). What you're planning is good, with the DK you can test with short advertising interval.

RE: nRF Master Control Panel Nexus 4 Mi Band

muhkuhns — Wed, 22 Apr 2015 11:52:52 GMT

Ah damn it. I once again missclicked convert to answer...

Yes, I do have different RSSI values when I change the distance between the devices. And that's the point: "there is no reason "disable continuous scan" can't capture changes on the RSSI." But still it won't. Sometimes it gives me at least 3 short horizontal lines (with different RSSI values)... but that was it.

But I tried the MiBand with another phone and the Control Panel and it did work as expected.. So it must be a problem on the Nexus 4 side.. Well I ordered my nRF51-DK and I'll try it again with a simple advertising package and my phone...

RE: nRF Master Control Panel Nexus 4 Mi Band

Hung Bui — Wed, 22 Apr 2015 11:48:10 GMT

Sorry I thought that it was a phone.

Mine Nexus 7 is at Android 5.0.2.

Do you have different RSSI value when you move your Nexus 4 far away from the Mi Band ? (close the app and open it again at different location)

What "disable continuous scan" does is to start and stop scanning on every 1 second. So if you can see different RSSI when you restart the app, there is no reason "disable continuous scan" can't capture changes on the RSSI.

RE: nRF Master Control Panel Nexus 4 Mi Band

muhkuhns — Wed, 22 Apr 2015 11:43:31 GMT

The Mi Band is a fitness tracker. It does not run Android. My Nexus 4 runs on 5.1

RE: nRF Master Control Panel Nexus 4 Mi Band

Hung Bui — Wed, 22 Apr 2015 11:42:19 GMT

@mugkuhns: I'm trying with "Continuous scanning" option turned off, and even though pretty slow, the RSSI is notified and changed when I moving the Nexus 7 around.

Which Android version is on your MiBand and Nexus 4 ?