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// vim: filetype=cpp
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xAD, 0xEE, 0x00, 0xEF, 0xFE, 0xED };
const char *serverHost = "stomp.xapek.org";
const int serverPort = 61613;
const char *serverLogin = "arduino1";
const char *serverPasscode = "arduino1";
const char *serverQueue = "/queue/queue-put";
const int ledPin = 13; // select the pin for the LED
struct StompHeader {
const char *name;
const char *value;
};
class StompClient; // Forward
struct StompFrame {
const char *command;
struct StompHeader *headers = 0;
int headersPos = -1;
const char *body = 0;
void (*bodyFunc)(class StompClient&) = NULL;
void addHeader(const char *name, const char *value) {
headersPos++;
headers = (StompHeader*)realloc(headers, sizeof(StompHeader) * (headersPos+1));
memset(headers + headersPos, 0, sizeof(StompHeader));
(headers+(sizeof(StompHeader)*headersPos))->name = name;
(headers+(sizeof(StompHeader)*headersPos))->value = value;
}
void setBody(const char *b) {
body = strdup(b);
}
StompFrame(const char *command) : command(strdup(command)) {};
~StompFrame() {
if (headers != NULL)
delete headers;
delete command;
if (body)
delete body;
}
};
class StompClient : public EthernetClient {
const char *serverHost;
int serverPort;
const char *serverLogin = NULL;
const char *serverPasscode = NULL;
public:
StompClient(const char *serverHost, int serverPort, const char *serverLogin, const char *serverPasscode) :
serverHost(serverHost), serverPort(serverPort), serverLogin(serverLogin), serverPasscode(serverPasscode) {};
int connect() {
int result = EthernetClient::connect(serverHost, serverPort);
if (result) {
StompFrame frame("CONNECT");
frame.addHeader("host", serverHost);
if (serverLogin) frame.addHeader("login", serverLogin);
if (serverPasscode) frame.addHeader("passcode", serverPasscode);
send(frame);
StompFrame *answer = readFrame();
if (strcmp(answer->command, "CONNECTED") != 0) {
Serial.print("Got no CONNECTED Frame, read: ");
Serial.println(answer->command);
stop();
delete answer;
return false;
} else {
delete answer;
return true;
}
} else {
return result;
}
};
void send(StompFrame &frame) {
EthernetClient::print(frame.command);
EthernetClient::print("\n");
for (int i = 0; i<=frame.headersPos; i++) {
StompHeader *header = frame.headers+sizeof(StompHeader)*i;
EthernetClient::print(header->name);
EthernetClient::print(":");
EthernetClient::print(header->value);
EthernetClient::print("\n");
}
EthernetClient::print("\n");
if (frame.bodyFunc) {
frame.bodyFunc(*this);
} if (frame.body) {
EthernetClient::print(frame.body);
}
EthernetClient::write((byte)0);
};
void sendKeyValue(const char *key, const char *value) {
EthernetClient::print(key);
EthernetClient::print("=");
EthernetClient::print(value);
EthernetClient::print("\n");
}
StompFrame *readFrame() {
char buf[255];
int i = readBytesUntil('\n', buf, 254);
buf[i] = '\0';
StompFrame *frame = new StompFrame(buf);
while (readBytesUntil('\n', buf, 255)) {
//read header
//ignore
}
readBytesUntil('\0', buf, 255);
frame->setBody(buf);
flush();
return frame;
}
};
const long ADC_REF_MV = 3300;
const long ADC_MAX_STEP = 1024;
const long OV_FACTOR = 4; // Op. Verstärker Faktor = 4; 10mV = 1dB
void sendPinValue(class StompClient& c) {
long sensorValue,
sensorValueMV,
sensorValueDBA,
pinnr;
char buf[12];
char *sensorKey = "arduino.aX",
*sensorKeyMV = "arduino.aX.mv",
*sensorKeyDBA = "arduino.aX.dba";
for (int i = A0; i <= A5; i++) {
pinnr = i - A0;
sensorValue = analogRead(i);
sensorKey[9] = '0' + pinnr;
snprintf(buf, 8, "%u", sensorValue);
c.sendKeyValue(sensorKey, buf);
sensorValueMV = sensorValue * (ADC_REF_MV*100/ADC_MAX_STEP);
sensorKeyMV[9] = '0' + pinnr;
snprintf(buf, 8, "%ld.%03ld", sensorValueMV/100, sensorValue%100);
c.sendKeyValue(sensorKeyMV, buf);
sensorValueDBA = sensorValueMV / OV_FACTOR;
sensorKeyDBA[9] = '0' + pinnr;
snprintf(buf, 12, "%ld.%04ld", sensorValueDBA/1000, sensorValueDBA%1000);
c.sendKeyValue(sensorKeyDBA, buf);
}
}
void setup() {
Serial.begin(9600);
// declare the ledPin as an OUTPUT:
pinMode(ledPin, OUTPUT);
// start the Ethernet and UDP: Use DHCP for IP-Configuration
Ethernet.begin(mac);
analogReference(EXTERNAL);
}
StompClient client(serverHost, serverPort, serverLogin, serverPasscode);
void loop() {
unsigned long dt = millis();
digitalWrite(ledPin, HIGH);
if (client.connected()) {
Serial.println("Send packet");
StompFrame frame("SEND");
frame.addHeader("destination", serverQueue);
frame.bodyFunc = &sendPinValue;
client.send(frame);
} else {
Serial.println("connecting");
client.stop();
if (client.connect()) {
Serial.println("connected");
} else {
Serial.println("connection failed");
}
}
digitalWrite(ledPin, LOW);
dt = (millis() - dt);
if (dt < 500) {
Serial.println(String("sleep: ") + String((500-dt)));
delay(500 - dt);
}
}
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