1-photon.cpp

#include "Particle.h"

// Test Program #1 for Google Cloud
// Just generates some simple random data once a minute. Also sends up the device name.

#include <math.h> // This is just for cos and M_PI, used in generating random sample data

// Forward declarations
void publishData();
void deviceNameHandler(const char *topic, const char *data);

const unsigned long PUBLISH_PERIOD_MS = 60000;
const unsigned long FIRST_PUBLISH_MS = 10000;
const char *PUBLISH_EVENT_NAME = "test2data";

unsigned long lastPublish = FIRST_PUBLISH_MS - PUBLISH_PERIOD_MS;
int nextValue = 1;
String deviceName;

void setup() {
	Serial.begin(9600);

	Particle.subscribe("spark/", deviceNameHandler);
	Particle.publish("spark/device/name");
}

void loop() {
	if (millis() - lastPublish >= PUBLISH_PERIOD_MS) {
		lastPublish = millis();
		if (deviceName.length() > 0) {
			publishData();
		}
	}
}

void publishData() {
	// This just publishes some somewhat random data for testing

	// a is a monotonically increasing integer
	int a = nextValue++;

	// double value b is a cosine, so the values will rise and fall nicely over 360 steps
	double b = cos((double)(a % 360) * M_PI / 180.0);

	// c is a random integer
	int c = rand();

	char buf[256];
	snprintf(buf, sizeof(buf), "{\"a\":%d,\"b\":%.3f,\"c\":%d,\"n\":\"%s\"}", a, b, c, deviceName.c_str());
	Serial.printlnf("publishing %s", buf);
	Particle.publish(PUBLISH_EVENT_NAME, buf, PRIVATE);
}

void deviceNameHandler(const char *topic, const char *data) {
	deviceName = data;
}