Question

我正在TI使用Code Composer Studio v6.1使用Energia 15在CC3200 LaunchPad上进行一些开发。我在CC3200上成功运行了WiFiUdpSendReceiveString示例但是当我发送时我遇到了一些奇怪的行为来自客户的消息。

以下是我的CC3200上的代码

#ifndef __CC3200R1M1RGC__
// Do not include SPI for CC3200 LaunchPad
#include <SPI.h>
#endif
#include <WiFi.h>

// your network name also called SSID
char ssid[] = "xxxxx";
// your network password
char password[] = "xxxxxxx";

unsigned int localPort = 2390;      // local port to listen on

char packetBuffer[255]; //buffer to hold incoming packet
char  ReplyBuffer[] = "acknowledged";       // a string to send back

WiFiUDP Udp;

void setup() {

  //Initialize serial and wait for port to open:
  Serial.begin(115200);

//  WiFi.deleteProfileSmartConfig();

  // attempt to connect to Wifi network:
  Serial.print("Attempting to connect to Network named: ");
  // print the network name (SSID);
  Serial.println(ssid); 
  // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
  WiFi.begin(ssid, password);
  while ( WiFi.status() != WL_CONNECTED) {
    // print dots while we wait to connect
    Serial.print(".");
    delay(1000);
    WiFi.begin(ssid, password);
  }

  Serial.println("\nYou're connected to the network");
  Serial.println("Waiting for an ip address");

  while (WiFi.localIP() == INADDR_NONE) {
    // print dots while we wait for an ip addresss
    Serial.print(".");
    delay(300);
  }

  Serial.println("\nIP Address obtained");
  printWifiStatus();

  Serial.println("\nWaiting for a connection from a client...");
  Udp.begin(localPort);
}

void loop() {

  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if (packetSize)
  {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remoteIp = Udp.remoteIP();
    Serial.print(remoteIp);
    Serial.print(", port ");
    Serial.println(Udp.remotePort());

    // read the packet into packetBufffer
    int len = Udp.read(packetBuffer, 255);

    if (len > 0) packetBuffer[len] = 0;
    Serial.println("Contents:");
    Serial.println(packetBuffer);

    // send a reply, to the IP address and port that sent us the packet we received
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }
}


void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

我正在使用我的Macbook终端作为客户端通过UDP发送消息，我发送了一系列命令来显示UDP问题：

echo -n "CAF99C4751FB1FD18F8A34BEBA411" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115BFC76" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115BFC76_199A88DF84A77684D148F8D9625B9" | nc -4u -w1 192.168.1.57 2390
echo -n "CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115BFC76_199A88DF84A77684D148F8D9625B9_3B4BD168F7A8D227EAB46FD442A63" | nc -4u -w1 192.168.1.57 2390

这是控制台输出：

Received packet of size 29
From 192.168.1.165, port 49634
Contents:
CAF99C4751FB1FD18F8A34BEBA411
Received packet of size 59
From 192.168.1.165, port 55833
Contents:
CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764
Received packet of size 89
From 192.168.1.165, port 59556
Contents:
CAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7
Received packet of size 119
From 192.168.1.165, port 59331
Contents:
CAFCAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1B78
Received packet of size 149
From 192.168.1.165, port 51635
Contents:
CAFCAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115B6
Received packet of size 179
From 192.168.1.165, port 54811
Contents:
CAFCAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115BFC76_199A88DF84A77684D148F8D5B9
Received packet of size 209
From 192.168.1.165, port 49242
Contents:
CAFCAF99C4751FB1FD18F8A34BEBA411_E622319E55D4E871D2D787DDF5764_6CFE84A6C76C437714C2C329C86C7_46AD7EDE29FA7CB319F71F1EEDB78_6723127C14F6254B149C7115BFC76_199A88DF84A77684D148F8D9625B9_3B4BD168F7A8D227EAB46FD443

在第四条消息上，它开始重复前3个字符，然后在某处附近截断3个字符。在第五条消息上，3个字符返回，但重复的前3个仍然存在。我不知道为什么会这样。似乎我的缓冲区大小在255（我已经尝试了1024）。有什么想法吗？

Answer 1

TI E2E论坛https://e2e.ti.com/support/wireless_connectivity/f/968/p/449876/1618051#1618051

回答了这个问题

Energia WiFiUdpSendReceiveString示例向消息添加字符 - CC3200

1 个答案: