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]+"\n";
}else {
val = str[i] + "_";
}
System.out.println(val);
mBluetoothLeService.WriteValue(val);
}
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.
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);
Here are two other very good explanations of how to achieve this:
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