如何在android中通过ble发送20多个字节的数据? [英] How to send more than 20 bytes data over ble in android?

问题描述

我正在尝试使用简单循环发送超过 33 个字节的数据，是否有人知道如何通过 android ble 发送超过 20 个字节的数据.

I am trying to send more than 33 bytes using simple loops, Is anybody has idea how to send more than 20 bytes data over android ble.

if(!mConnected) return;
        for (int i = 0; i<str.length;i++) {
            if(str[i] == str[str.length -1]){
                 val = str[i]+"
";
            }else {
                val = str[i] + "_";
            }
            System.out.println(val);
            mBluetoothLeService.WriteValue(val);
        }

推荐答案

通过将数据拆分为 20 字节的数据包并实现短延迟(即使用 sleep()) 之间发送每个数据包.

Sending more than 20 bytes via BLE is easily achievable by splitting your data into 20 byte packets and implementing a short delay (i.e. using sleep()) between sending each packet.

这是我正在处理的一个项目中的一小段代码，它以 byte[] 的形式获取数据并将其拆分为相同的数组，( byte[][] )，以 20 字节的块为单位，然后将其发送到另一种方法，该方法将每个数据包一个一个地传输.

Here's a short snippet of code from a project I'm working on that takes data in the form of byte[] and splits it into an array of the same, ( byte[][] ), in 20 byte chunks, and then sends it to another method that transmits each packet one by one.

    int chunksize = 20;
    byte[][] packets = new byte[packetsToSend][chunksize]; 
    int packetsToSend = (int) Math.ceil( byteCount / chunksize);

    for(int i = 0; i < packets.length; i++) {
        packets[i] = Arrays.copyOfRange(source,start, start + chunksize);
        start += chunksize;
    }

    sendSplitPackets(packets);

这里有另外两个关于如何实现这一点的非常好的解释:

Here are two other very good explanations of how to achieve this:

(Stackoverflow) Android:通过 BLE 发送 >20 字节的数据

(Nordic Semi) 处理大数据包通过 BLE

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