Update Almost there I can receive messages I think. When the code is readable, I will put it in. Trying to send also..
Original question
I'm trying to connect my esp8266 (@38400 baud) ($3.50 wifi chip :)), to a Websocket. The chip is connected with a Arduino pro mini. This setup is OK and it works.
I am able to do a handshake, thanks to some code (https://github.com/ejeklint/ArduinoWebsocketServer).
So this is what the program has to do:
- Handle handshake V
- Receive message Received some unknown chars
- Sending (when I'm able to receive, I will find out how to send)
I'm testing websocket with: http://www.websocket.org/echo.html
connecting with my wifi module ws://192.168.1.104:8000
When I send 3 x the message "aaaa" to my Arduino I receive this:
+IPD,0,10: | | | q | | b | k | | c | | |
+IPD,0,10: | | | ¦ | ¡ | 0 | P | Ç | À | Q | 1 |
+IPD,0,10: | | | _ | ò | ± | ? | > | | Ð | ^ | |
How can I decode this?
#include "sha1.h"
#include "Base64.h"
#include <SoftwareSerial.h>
#include <MemoryFree.h>
SoftwareSerial debug(8, 9); // RX, TX
void setup() {
Serial.begin(38400);
debug.begin(38400);
delay(50);
debug.println("start");
Serial.println("AT+RST");
delay(5000);
Serial.println("AT+CWMODE=1"); // NO CHANGE
delay(1500);
Serial.find("OK");
Serial.println("AT+CIPMUX=1");
Serial.find("OK");
delay(3000);
Serial.println("AT+CIPSERVER=1,8000");
boolean server = Serial.find("OK");
delay(3000);
Serial.println("AT+CIFSR"); // Display the ip please
boolean r = readLines(4);
debug.println("eind setup");
debug.println(server);
boolean found = false;
while(!found) // wait for the link
found = Serial.find("Link");
debug.println("link builded, end setup");
}
void loop() {
String key = "";
boolean isKey = Serial.find("Key: ");
if(isKey) {
debug.println("Key found!");
while(true) {
if(Serial.available()) {
char c = (char)Serial.read();
if(c == '=') {
doHandshake(key + "==");
key = "";
break;
}
if(c != '\r' || c != '\n') {
key = key + c;
}
}
}
// _________________________ PROBLEMO ____________________________________
while(true) { // So far so good. Handshake done Now wait for the message
if(Serial.available()) {
char c = (char)Serial.read();
debug.print(c);
debug.print(" | ");
}
}
}
// _________________________ /PROBLEMO ____________________________________
}
boolean readLines(int lines) {
boolean found = false;
int count = 0;
while(count < lines) {
if(Serial.available()) {
char c = (char)Serial.read();
if(c != '\r') {
debug.write(c);
} else {
count++;
}
}
}
return true;
}
bool doHandshake(String k) {
debug.println("do handshake: " + k);
char bite;
char temp[128];
char key[80];
memset(temp, '\0', sizeof(temp));
memset(key, '\0', sizeof(key));
byte counter = 0;
int myCo = 0;
while ((bite = k.charAt(myCo++)) != 0) {
key[counter++] = bite;
}
strcat(key, "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"); // Add the omni-valid GUID
Sha1.init();
Sha1.print(key);
uint8_t *hash = Sha1.result();
base64_encode(temp, (char*)hash, 20);
debug.print(temp);
int cc = -1;
while(temp[cc++] != '\0') {} // cc is length return key
cc = 165 + cc; // length return key + 165 keys for rest of header
Serial.print("AT+CIPSEND=0,");
Serial.println(129); // +30 // was 129
boolean found = false;
while(!found)
found = Serial.find(">"); // Wait until I can send
Serial.print("HTTP/1.1 101 Switching Protocols\r\n");
Serial.print("Upgrade: websocket\r\n");
Serial.print("Connection: Upgrade\r\n");
Serial.print("Sec-WebSocket-Accept: ");
Serial.print(temp);
Serial.print("\r\n\r\n");
return true;
}
