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chipweinberger / flutter_blue_plus

Flutter plugin for connecting and communicationg with Bluetooth Low Energy devices, on Android, iOS, macOS
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[Help]: Fast Data transfer from BLE device. #685

Closed karthikmohan4 closed 1 year ago

karthikmohan4 commented 1 year ago

As read & write method is async. It would ideally take 54sec to transfer 9654 Bytes , packet by packet from the BLE device. If MTU is set more than 23, there is data loss.

How to basically achieve the fast data transfer in less time.

BLE device version : 4.2

chipweinberger commented 1 year ago

increase mtu is the only solution.

if there is data loss it is a bug in your code or device.

joyhope commented 1 year ago

The library is no problem for fast BLE data transfer. Thanks to the author's hard working.

If problems happen, it is the device and your code.

karthikmohan4 commented 1 year ago

So what should be the ideal time to receive the data from BLE device for ex: 9654 bytes.?

Apart from read/write does any method helps us to retrieve data fast like sstream.

My code follows (req-res) method.

  1. write some data
  2. read the data (takes 2 sec to read 517 Bytes).

Also the ble device version is 4.2. Would that be a reason for slow transfer. ?

Can you provide any resource related to this.

BTW thanks for the package.

joyhope commented 1 year ago

In fact, it is a little complicated. There is a negotiation between PHONE (BLE SERVER) and the device for the interval, MTU, and some other communication parameters. If you could control your device's BLE code, and then you could adjust BLE data performance, otherwise nothing could be improved. These parameters are much more important than the BLE library.

chipweinberger commented 1 year ago

also, it will be faster if your ble device supports notifications & you use setNotifyValue and onValueReceived.

chipweinberger commented 1 year ago

closing because there is nothing more for FBP to do