Flutter 蓝色 从 BLE 设备向 App 发送相当大的文件

Question

I need to send a file.txt from a device to my app (worst case almost 2mb). The BLE device divide the file into packages. I don't know if my method is correct, but I create a loop of characteristic.write/characteristic.read telling everytime what package the device has to send. Here's my code:

    for(int i = 0; i < packNumber.length; i++) {
        initialValue = '9,50,100,$i,0,$checksumId,0/';
        await characteristic
         .write(utf8.encode(initialValue)).then((wValue) async {
                 await Future.delayed(Duration(milliseconds: 100)).then((value) async {
                       await characteristic.read().then((rValue) {
                            //do something with rVlaue
                       });
                 });
        });
   }

It works, but is it the best solution? And in case how can I speed up the transfer (for now I have to set a delay before reading, waiting for characteristic.write to finish)?

Thank you guys

Answer 1

You should change the remote device to send notifications instead of using reads. That gives maximum throughput.