Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

Seth Foster — Tue, 17 Oct 2017 14:00:51 GMT

I see some odd behavior specifically with the S8 - for some reason it appears to be reserving two bytes of payload. I've tried:

Negotiate ATT MTU of 69 and try to send 66 bytes, since there should be 3 bytes of ATT overhead: truncated to 64 bytes
Negotiate ATT MTU of 158 and try to send 155 bytes: truncated to 153 bytes

This doesn't occur on an S7, am I missing a source of overhead?

All of these tests are done with a PDU max size large enough to fit the ATT packet in one PDU.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

schef — Fri, 22 Sep 2017 11:17:39 GMT

I also have the ringbuffer errors. How is it possible that main.c uses classes inside (myCamera)? Isn't .c suposed to be compiled with gcc and .cpp with c++?

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

kanchun — Fri, 11 Aug 2017 07:14:03 GMT

Great job and the potential is unlimited. Thanks for sharing.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

Josh Blackann — Wed, 31 May 2017 20:26:50 GMT

Has anyone been able to get this to build? I pulled down the code and tried to build it with my version of IAR. I get a bunch of errors that appear to be associated with ringbuffer.h, which appears to be for ringbuffer.cpp.
The default settings for the project are:

If tried to change the project to C++ and it resulted in large number of errors.

Does it matter where the additional files (found in the cpplib) folder is placed? Do the files in the cpplib folder need to be built differently?

Please let me know if anyone else has success.

Thanks.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

ovrebekk — Tue, 23 May 2017 07:15:17 GMT

Hi all

Emil:
I haven't tried making the phone the peripheral, but I doubt this would provide any higher throughput. You don't have to be the master device to end the connection event, either device can just stop ACK'ing the packets. Since most use cases require the phone to be the central I expect the performance to be better in this case.

Mango:

I think the production chip is expected for a Q1 2018 release.
Yes, the Android app is also available on Github: Android-Image-Transfer-Demo

Dmitry:
Yes, the example should work with any phone back to Bluetooth 4.0. BLE is designed to allow newer devices running a newer version of the standard to communicate with older devices, simply by disabling features not supported on both sides.

The device list in the app will only show devices advertising the right unique UUID. Unless you have programmed a kit with the image transfer firmware you will not see any devices in the list.

Best regards
Torbjørn

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

Dmitry Korzh — Fri, 19 May 2017 18:50:30 GMT

Hello, dear Nordic community !!! I wanted to ask correctly that this example can work with 4.2 BLE phone, for example with a nexus 5x? Because in the description for the repository on the Githab like this is implied, or am I wrong? And in general, Bluetooth 5 is compatible with BLE 4.2 immediately, for example, all services from Bluetootn 5 will be visible on BLE 4.2?

I just tried to launch your application on Android 7 (Nexus 5 X) and did not see this application of more than one device BLE (stm, TI, Silicone labs) although in the program the device search is implemented just like that from all the applications for android only TI saw all the devices (at least saw;) What is the reason I can not understand( thanks.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

MANGO — Thu, 18 May 2017 01:24:27 GMT

Great demo, I wish other smartphone vendors to adopt Bluetooth 5 soon.

Can I ask some questions?

Can you share the timeline for PCA10056 version 1 (a production version)? I wish to buy a stable version rather than the preview kit.
Torbjørn has shared the Github Link.

Are you going to share the Android demo app as well?

-Best Regards, MANGO

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

ovrebekk — Fri, 12 May 2017 14:20:46 GMT

Also, the source code for the demo is now available on Github if you want to have a look at it; https://github.com/NordicSemiconductor/nrf52-ble-image-transfer-demo

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

John Leonard — Thu, 11 May 2017 09:47:05 GMT

A request to use a different data-rate is passed to the SoftDevice from the application via the softDevice API. Further details than that I suggest you contact our technical support via Nordic Mypage and they can elaborate. Additionally all you need to know about the S132 SoftDevice is available in online documentation.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

soumil — Thu, 11 May 2017 08:52:34 GMT

Awesome thanks. This is a great tutorial. Also could you explain a bit about how you switch from 1Mbps to 2Mbps speed when the devices are connected to each other? Is it done by updating the connection parameters or something else? I haven't read the Bluetooth 5.0 spec which is why I am asking you here.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

John Leonard — Thu, 11 May 2017 08:21:11 GMT

Hi, we used an Arducam Mini module such as this here:

link text

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

soumil — Thu, 11 May 2017 07:58:14 GMT

Which camera sensor are you using here?

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

John Leonard — Wed, 10 May 2017 19:51:09 GMT

Hi Yacire, To answer your questions in order:

Yes, it is possible to use all 3 features within an application but not of course at exactly the same time. There is a PHY level switchover going from 2Mbps to say 125kbps for the long range mode, for example.

To put this in context, perhaps you have an outside camera relaying to a display behind the door in the hallway, this might run at at 2 Mbps when the doorbell is pressed. The doorbell button itself might connect over long range mode at 125kbps to a central home alarm unit to inform someone has pressed the doorbell.

These two operations would run in the same application, but there would be an switchover on the device between the PHYs (very quick and completely transparent to the user). The same principle applies to the use of Advertising Extensions.

The peak power remains pretty much the same for any of these operations so from peak power perspective, yes, unchanged and still very low. when we look at average power then to go to 2Mbps your on-air time will typically be halved, and so will your average energy consumption, so here even less power.

In long range the on air bit time is longer as it will typically be at 125kbps, so average current used per bit will be x 8. However long range will largely be used for sensing/actuating functions requiring short packets transmitted infrequently, so overall current consumption should still average out as very low.

RE: Bluetooth 5 2Mbps Demo with nRF52 Series and Samsung Galaxy S8

Yacire — Wed, 10 May 2017 19:27:34 GMT

Hi,

Good presentation :)

But i have a question about this exiting norm of Bluetooth:

Is it possible to have all features (High throughput + Advertising extensions + long range) of Bluetooth 5 in the same application ?

if yes, it is always "low energy" or not ?

for your application in the video, have you measured the power consumption of the nrf52840 DK ?

Thanks for your work Nordic Team.

regards, Y.