Hi
i'm a beginner, so maybe there is some strange things in this code, (don't blame me 
)
I try to use an arduino to push sensor values to a raspberry pi, to change some dummy sensor with a json request.
When i send one request, it works, but when i try to send multiple json with a "GET", the serial monitor return me the "connection failed" in the end of the sketch, like the program never try to execute the GET2 part…
i actually try to use this with two ultrasonic sensor, but i want to add many other devices on the arduino to create chip and modulars sensors.
The code :
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
boolean received = false;
boolean get2 = false; // switch between the two GET
EthernetClient client;
char server[] = "192.168.0.150";
unsigned long lastConnectionTime = 0;
boolean lastConnected = false;
const unsigned long postingInterval = 10000; // delay between updates, in milliseconds de base 5000
// declaration capteur
int trig = 6;
int echo = 7;
long lecture_echo;
long cm;
int trig2 = 8;
int echo2 = 9;
long lecture_echo2;
long cm2;
// fin declaration capteur
void setup() {
// capteur
pinMode(trig, OUTPUT);
digitalWrite(trig, LOW);
pinMode(echo, INPUT);
pinMode(trig2, OUTPUT);
digitalWrite(trig2, LOW);
pinMode(echo2, INPUT);
//
randomSeed(analogRead(0));
Serial.begin(9600);
delay(1000);
Ethernet.begin(mac);
}
void loop() {
//capteur
digitalWrite(trig, HIGH);
delayMicroseconds(10);
digitalWrite(trig, LOW);
lecture_echo = pulseIn(echo, HIGH);
cm = lecture_echo / 58;
Serial.print("Distancem : ");
Serial.println(cm);
delay(2000);
digitalWrite(trig2, HIGH);
delayMicroseconds(10);
digitalWrite(trig2, LOW);
lecture_echo2 = pulseIn(echo2, HIGH);
cm2 = lecture_echo2 / 58;
Serial.print("Distancem2 : ");
Serial.println(cm2);
delay(2000);
// fin capteur
while (client.available()) {
char c = client.read();
Serial.print(c);
received = true;
}
if(received)
{
client.stop();
received = false;
}
if (!client.connected() && lastConnected) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
}
if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
int i = random(10000);
String reading = "1:" + String(i);
httpRequest(reading);
}
lastConnected = client.connected();
}
// first GET
void httpRequest(String val) {
if (client.connect(server, 8080) && !get2) { // rajout
Serial.println("connecting...");
Serial.println("Sending " + val);
client.print("GET /json.htm?type=command¶m=udevice&idx=33&nvalue=0&svalue=");
client.print(cm);
client.println(" HTTP/1.1");
client.println("Host: *HOST*");
client.println("Connection: keep-open");
client.println();
lastConnectionTime = millis();
get2 = true;
}
// second GET
else if (client.connect(server, 8080) && get2) {
Serial.println("connecting...");
Serial.println("Sending " + val);
client.print("GET /json.htm?type=command¶m=udevice&idx=32&nvalue=0&svalue=");
client.print(cm2);
client.println(" HTTP/1.1");
client.println("Host: *HOST*");
client.println("Connection: keep-open");
client.println();
lastConnectionTime = millis();
get2 = false;
}
// end second get
else {
Serial.println("connection failed");
Serial.println("disconnecting.");
client.stop();
get2 = false; // debug
}
}
and the serial return :
Distancem : 141
Distancem2 : 0
connecting...
Sending 1:8943
Distancem : 142
Distancem2 : 0
HTTP/1.0 200 OK
Content-Length: 53
Content-Type: text/html;charset=UTF-8
Cache-Control: no-cache
Pragma: no-cache{
"status" : "OK",
"title" : "Update Device"
}disconnecting.
Distancem : 140
Distancem2 : 0
connection failed
disconnecting.
Distancem : 140
Distancem2 : 0
(the result 0 of the "distancem2" was normal, not plugged when testing)
So if someone has a solution, I'll take it
Thanks
yoann
