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我使用以下Arduino websocket library，當嘗試發送超過65535個字符的郵件時出現問題，我收到了握手失敗錯誤。
只要消息沒有超過這個長度，它的工作完美使用websocket協議，Arduino不支持大於65535個字符的消息？
有圖書館的主網頁，指出在一張紙條：
Because of limitations of the current Arduino platform (Uno at the time of this writing),
this library does not support messages larger than 65535 characters.
In addition, this library only supports single-frame text frames.
It currently does not recognize continuation frames, binary frames, or ping/pong frames.
名爲客戶端頭文件WebSocketClient .H有以下評論：
// Don't allow the client to send big frames of data. This will flood the arduino memory and might even crash it.
#ifndef MAX_FRAME_LENGTH
#define MAX_FRAME_LENGTH 256
#endif
我用這個舊庫，因爲這是對我的Arduino WIFI shield，我可能是唯一一個爲我工作沒有找到其他支持WiFi屏蔽的庫，因爲大多數websocket庫都是爲Arduino Eathernet Shield支持編寫的，我沒有這種支持。
我的Arduino代碼爲
/*DS18 Libs*/
#include <dht.h>
#include <OneWire.h>
#include <DallasTemperature.h>
/*Websocket Libs*/
#include <WebSocketServer.h>
#include <WebSocketClient.h>
#include <sha1.h>
#include <MD5.h>
#include <global.h>
#include <Base64.h>
#include <SPI.h>
#include <WiFiUdp.h>
#include <WiFiServer.h>
#include <WiFiClient.h>
#include <WiFi.h>
#include <string.h>
char ssid[] = "AMM";
char pass[] = "027274792";
int status = WL_IDLE_STATUS;
IPAddress server(192, 168, 1, 3);
WiFiClient WiFiclient;
WebSocketClient WSclient;
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
//Humidture
dht DHT;
#define DHT11_PIN 4
void setup()
{
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
//check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while (true);
}
// attempt to connect to Wifi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network:
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data:
Serial.print("You're connected to the network");
/* Connect to the websocket server*/
if (WiFiclient.connect(server, 8080)) {
Serial.println("Connected");
}
else {
Serial.println("Connection failed.");
while (1) {
// Hang on failure
}
}
// Handshake with the server
WSclient.path = "/MyServer/endpoint/testtest/device/d6220ae7-caa9-48b5-92db-630c4c296ec4";
WSclient.host = "192.168.1.3:8080";
if (WSclient.handshake(WiFiclient)) {
Serial.println("Handshake successful");
}
else {
Serial.println("Handshake failed.");
while (1) {
// Hang on failure
}
}
/*DS18*/
sensors.begin();
}
void loop()
{
WSclient.sendData("{\"service_code\":\"89c4da72-a561-47db-bf62-8e63f8c4bbf0\",\"data\":[" + getHumidtureValue() + "],\"service_type\":\"TemperatureHumidityAnalysis\"}");
WSclient.sendData("{\"service_code\":\"bdc0f984-6550-4712-881f-b09071da5a73\",\"data\":" + getCBodyTempretureValue() + ",\"service_type\":\"TemperatureGaugeMonitor\"}");
//line-3 commented WSclient.sendData("{\"service_code\":\"8c212432-a86e-4c18-a956-9dc0dbb648d4\",\"data\":[" + getHumidtureValue() + "],\"service_type\":\"HumidityGaugeMonitor\"}");
}
String getCBodyTempretureValue()
{
sensors.requestTemperatures(); // Send the command to get temperatures
char charVal[10];
return dtostrf(sensors.getTempCByIndex(0), 4, 2, charVal);
}
String getHumidtureValue()
{
String str = "";
for (int i = 0; i < 2; i++)
{
int chk = DHT.read11(DHT11_PIN);
switch (chk)
{
case DHTLIB_OK:
Serial.println("OK,\t");
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.println("Checksum error,\t");
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.println("Time out error,\t");
break;
default:
Serial.println("Unknown error,\t");
break;
}
char charVal[10];
double tempF = (DHT.temperature * 9)/5 + 32;
str = dtostrf(tempF, 3, 1, charVal);
str = str + "," + dtostrf(DHT.humidity, 3, 1, charVal);
Serial.println(str);
delay(200);
}
return str;
}
上面的代碼完美的作品，當我去掉第三發送聲明在循環功能，我得到了握手失敗的錯誤。
- 考慮到這個庫是舊的，是否可以安全地修改新版本Arduino板的MAX_FRAME_LENGTH的值？
- 有沒有其他的庫比這個可以支持WiFi上的websocket更好的庫？
任何解決方案或想法將不勝感激。
在此先感謝。