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esp8266_1_aws.ino
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esp8266_1_aws.ino
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#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include <time.h>
#include "Secrets.h"
#include <DallasTemperature.h>
#define ONE_WIRE_BUS D2 // DS18B20 sensor
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
DeviceAddress a;
float temp;
unsigned long lastMillis = 0;
const long interval = 5000;
#define AWS_IOT_PUBLISH_TOPIC "esp8266_1/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "esp8266_1/sub"
WiFiClientSecure net;
BearSSL::X509List cert(cacert);
BearSSL::X509List client_crt(client_cert);
BearSSL::PrivateKey key(privkey);
PubSubClient client(net);
time_t now;
time_t nowish = 1510592825;
void NTPConnect(void)
{
Serial.print("Setting time using SNTP");
configTime(TIME_ZONE * 3600, 0 * 3600, "pool.ntp.org", "time.nist.gov");
now = time(nullptr);
while (now < nowish)
{
delay(500);
Serial.print(".");
now = time(nullptr);
}
Serial.println("done!");
struct tm timeinfo;
gmtime_r(&now, &timeinfo);
Serial.print("Current time: ");
Serial.print(asctime(&timeinfo));
}
void messageReceived(char *topic, byte *payload, unsigned int length)
{
Serial.print("Received [");
Serial.print(topic);
Serial.print("]: ");
for (int i = 0; i < length; i++)
{
Serial.print((char)payload[i]);
}
Serial.println();
}
void connectAWS()
{
delay(3000);
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.println(String("Attempting to connect to SSID: ") + String(WIFI_SSID));
while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
delay(1000);
}
NTPConnect();
net.setTrustAnchors(&cert);
net.setClientRSACert(&client_crt, &key);
client.setServer(MQTT_HOST, 8883);
client.setCallback(messageReceived);
Serial.println("Connecting to AWS IOT");
while (!client.connect(THINGNAME))
{
Serial.print(".");
delay(1000);
}
if (!client.connected()) {
Serial.println("AWS IoT Timeout!");
return;
}
// Subscribe to a topic
client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
Serial.println("AWS IoT Connected!");
}
void publishMessage()
{
StaticJsonDocument<500> doc;
DS18B20.requestTemperatures();
uint8_t count = DS18B20.getDS18Count();
char str[40];
doc["time"] = time(nullptr);
doc["sensors"] = count;
for (int i = 0; i < count ; i++){
temp = DS18B20.getTempCByIndex(i);
if (DS18B20.getAddress(a, i))
sprintf(str, "temperature_%02X%02X%02X%02X%02X%02X%02X%02X", a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7]);
else
sprintf(str, "temperature_%d", i);
doc[str] = serialized(String(temp,2));
}
/*temp = DS18B20.getTempCByIndex(0);
doc["temperature"] = temp;*/
char jsonBuffer[512];
serializeJson(doc, jsonBuffer); // print to client
client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}
void setup()
{
Serial.begin(115200);
connectAWS();
DS18B20.begin();
}
void loop()
{
delay(2000);
now = time(nullptr);
if (!client.connected())
{
connectAWS();
}
else
{
client.loop();
if ((millis() - lastMillis > 300000) || (lastMillis == 0))
{
lastMillis = millis();
publishMessage();
}
}
}