通过蓝牙 Python - Java 发送 15 000 字节

Question

我想通过蓝牙发送 15 000 个 caracteres(或 15 000 字节(与协议 RFCOMM。

我用它来在python上发送数据：

from pylab import*
from rtlsdr import*
from bluetooth import*
import sys
#configure device
sdr= RtlSdr()
sdr.sample_rate=double(sys.argv[3])
sdr.gain=double(sys.argv[2])
sdr.center_freq=double(sys.argv[1])
NFFT=50
#Bluetooth connection
server_sock=BluetoothSocket(RFCOMM)
server_sock.bind(("",PORT_ANY))
server_sock.listen(1)
port=server_sock.getsockname()[1]
uuid="94f39d29-7d6d-437d-973b-fba39e49d4ee"
client_sock,client_info=server_sock.accept()
while(1):
samples=sdr.read_samples(256*1024)
result=psd(samples,NFFT, Fs=sdr.sample_rate/1e6,    Fc=sdr.center_freq*1e6/1e6)
tab_freq=(result[1]/1e6) 
value_freq=str(tab_freq)[1:-1]
value_list=[format(float(v), ".10f") for v in value_freq.split()]
value_freq2= "n".join(value_list)
tab_pxx=result[0]
value_pxx=str(tab_pxx)[1:-1]
client_sock.send(value_freq2+'n'+'n'.join(value_pxx.split()))

这是为了获取java上的数据：

public void run() {
byte[] buffer = new byte[1048576]; // 20 bits
int bytes;
String strRx = "";
while (running) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived_freq = new String(buffer,0, bytes);
final String strReceived_pxx = new String(buffer,(bytes/2)+1, bytes);
//final int samples_sdr=new Integer(buffer,0,bytes);
final String strByteCnt = String.valueOf(bytes) + " bytes received.n";
runOnUiThread(new Runnable(){
@Override
public void run() {
Pxx_value.setText(strReceived_pxx+"n");    // get data PXX
freq_value.setText(strReceived_freq+"n"); // get data freq
// plot value
/*  for (int i=0; i<nb_points; i++)
{
freq[i]=Double.parseDouble(strReceived_freq);
pxx[i]=Double.parseDouble(strReceived_pxx);
series.appendData(new DataPoint(freq[i],pxx[i]), true,500);
}*/
}});

问题是，在 33 点 (NFFT( 之后，我无法发送更多数据，所以我的代码正在重写并擦除我最后的数据......

我该如何解决？

感谢您的帮助！

Answer 1

我终于找到了原因。树莓派配备了蓝牙 4.1，每个数据包长度最多可以发送 33 个字节。如果您想获得更多，则需要升级蓝牙版本(蓝牙 4.2 最多可以发送 257 字节的数据包长度(。

来源 ： http://www.cypress.com/file/224826/download