How to send large data through BLE notification using nrf52832 over Uart Ble

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Andy — Fri, 05 Apr 2019 13:39:36 GMT

Dude, people are here to ask and answer specific questions, not to develop projects for random people on the internet.

As Einar already said, take a look at the NUS and the throughput examples. The NUS example will help you figure out how to send large amounts of data, and the throughput example will help you figure out how to send it quickly.

"Please help me do my project" is not a valid question.

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Manjunath K S — Thu, 04 Apr 2019 13:17:56 GMT

I have 40 kb of data i need to send, and what i thought was using notification by creating a timer, which will be started as soon as device gets connected, in the timeout handler i will convert every data to string using sprintf 7 send in that for loop, which will be written inside timeout handler, but i am not able to receive all the data y.

or what should i do to achieve this in Uart ble example project , please help me ASAP.

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Einar Thorsrud — Thu, 21 Mar 2019 09:36:39 GMT

Hi,

There is nothing preventing you from using NUS with Linux (RPi). Nordic does not provide any examples, but you can make yourself or refer to some other customers code, such as this (I have never tested it).

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Manjunath K S — Thu, 21 Mar 2019 05:20:13 GMT

can u please help me with this issue

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Manjunath K S — Wed, 20 Mar 2019 14:54:47 GMT

my actual problem statement is:

I am collecting tri axial accelerometer data with sampling rate of 1600 samples/sec,after the acquisition of 4 seconds data,

about 6 bytes per sample about 38.4 Kb i need to transfer this data Over Ble to raspberry Pi model 3B.

If u can help me at raspberry pi end also it will be great which i am still searching.

How should i proceed.

can i use Ble Nus service for this.

RE: How to send large data through BLE notification using nrf52832 over Uart Ble

Einar Thorsrud — Wed, 20 Mar 2019 13:34:03 GMT

Hi,

I am not sure exactly what you are asking about, so I will giv you a few hints about how to transfer large amounts of data as fast as possible, since that seems to be what you are after. Please elaborate and specify if you need more specific advice later.

To achieve high throughput, you should try to optimize the following:

User long packets.
Use long connection events and connection intervals that match (not too short).
Use notifications.

You can refer to the throughput example in the SDK. You can also adapt the BLE UART example since you allready mentioned it (it was not clear to me if you wanted to not use the NUS service, or just did not what to use physical UART).