How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

vishal — Thu, 26 Apr 2018 05:29:18 GMT

Hi,

I have provide the same information in my other thread and also which is in more details what i want and what is the flow of my project.

But we have less time as of now, in my other thread until not get any answer from Nordic mesh team.

Thanks for your reply..

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

tesc — Wed, 25 Apr 2018 16:38:06 GMT

HI,

Thanks for the information. Please provide the same information in the other thread and keep further discussion regarding UART throughput there.

Regards,
Terje

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

vishal — Wed, 25 Apr 2018 15:17:11 GMT

Hi,

Actually, now i am able to send this all data client to server but it take more time for sending. That's why i am create other question for how i can increase speed.

In my server side i have merged UART example from nRF5 SDK 14.1 into mesh sdk. Not use mesh serial example in my application. UART example is used because i have interface external WIFI module for sending data to own server.

We are lots of searching and trying different different option but until not get solution, please can you tell me how i can increase the throughput of sending data to server node.

I will update my other thread with clear description.

Thanks

Vishal

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

tesc — Wed, 25 Apr 2018 10:49:58 GMT

Hi,

I am sorry for not coming back to you earlier. I see that you have opened a new question thread instead, which I think is good as this is a new question. The original question was about sending a large amount of data, and the new question is about transfer speed over UART.

Can you update that other thread with a precise description of what UART example you use? It is not clear if you mean the serial example from the nRF5 SDK for Mesh, or if you have merged with an UART example from the nRF5 SDK.

Regards,
Terje

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

vishal — Tue, 17 Apr 2018 14:59:09 GMT

Thanks for your reply,

Now, i have sent all 24KB data from client to sever for that i have sent 256 bytes in each messages . but one of the my other server node in that i have interface UART example. In this server node uart functionality use for communicate with wifi module. only when i send this data to this uart server the data is very slow transmit ans received as well.

Can you please why is slow transmitting and receiving for uart merge example server.

Is it any other configuration for the same if i use uart in server side.

When i sent all data to simple mesh server it is fast sending as well receiving.

Looking forward your reply...!!

Thanks.

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

tesc — Mon, 16 Apr 2018 15:54:24 GMT

Hi,

Although it its possible with the instaburst feature to send that large messages, I would recommend not to use the maximum. The reason is that the longer the packet, the larger the risk of packet collition. You have to find a good packet length for your particular use case. Then the number of messages to send depends on that packet length value.

We do not have an API for sending a stream of data over several messages. This means you must implement that part yourself. It may be similar to DFU, but DFU does not use mesh messages.

I am afraid we do not have a code example at the moment, for sending large amounts of data over Bluetooth Mesh.

Please also note that sending that large amount of data will take some time. How often do you want to send those 25 kb of data?

Regards,
Terje

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

vishal — Wed, 11 Apr 2018 15:27:07 GMT

Thank you so much for your reply,

If i split my data into different message how i can manage this message in mesh network. Because we need to send data to other node sequentially it has analog readings.

For sending 25kb data i need to split in 5 messages is it write. for sending those messages through instabrust feature in that which api need to call for sending all messages.

Actually i have refer this Nordic Advertiser Extensions (Instaburst) and configure in my code. But not able to understand which API use in main.c for sending data sequentially one by one message.

As mentioned you in 2 ans DFU send large file, i look DFU main.c file example but instead of this how i can send many message and reception at the server node.

Please can you give me example code for sending all data, if not please suggest which api instabrust feature i need to use for sending those all messages.

Thanks..

RE: How i use "InstaBurst feature" for sending large amount of sensor data in mesh network?

tesc — Wed, 11 Apr 2018 13:03:21 GMT

Hi,

Please note that Bluetooth Mesh is best suited for use cases where you have many nodes, possibly over a large area, but where the required data throughput is low. Although Bluetooth Mesh was not written for large data transfers this may still be possible although not in one message and only with low frequency (ref. DFU, which uploads full firmware binaries.)

1. Although our Instaburst feature uses extended advertising, it is limited to the auxiliary packet and a single chain packet. We provide some performance numbers in the Nordic Advertiser Extensions (Instaburst) chapter of the nRF5 SDK for Mesh documentation, and it states that you get 498 bytes of advertising data over the bearer for every advertising interval. Subtract overhead throughout the stack and you are left with around 1/3 of that as access layer payload. With maximum 32 segments that becomes approximately 32 * 498 / 3 = ~5k, which is 1/5 of what you ask for.

2. As long as the total throughput is low enough you may of course split up the data in as many messages that you want. This resembles what we did for DFU: In order to send large files we are sending packets of smaller size which are assembled to the full firmware binary after reception.

3. Our Mesh stack in the nRF5 SDK for Mesh has its own implementation of the required Advertising Extensions for our Instaburst feature. Support for those features is not required from the SoftDevice, and s132 v3.1.0 should work perfectly well.

4. Please see the "Usage in the mesh" section of the Nordic Advertiser Extensions (Instaburst) documentation on Infocenter.

Regards,
Terje