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nodeMCU_SoftSerial_OTA_SML2MQTT.ino
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nodeMCU_SoftSerial_OTA_SML2MQTT.ino
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/*
Program for isolating and publishing smartmeter sml messages to a mqtt broker by using a esp8266.
Version 1 for nodeMCU or Adafruit Huzzah boards
@author Tim Abels <rollercontainer@googlemail.com>
@see The GNU Public License (GPL)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#define RX_PIN 4 // for NodeMCU: GPIO4 = D1
#define TX_PIN 5 // for NodeMCU: GPIO5 = D2
#define MQTT_MAX_PACKET_SIZE 1024 // Maximum packet size (mqtt max = 4kB)
#define MQTT_KEEPALIVE 120 // keepAlive interval in Seconds
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
// Software serial is needed for debuging reasons.
// esp8266 has only one real hardware serial which is connected to usb
#include <SoftwareSerial.h> // https://github.com/plerup/espsoftwareserial
#include <PubSubClient.h> // https://github.com/knolleary/pubsubclient/blob/master/examples/mqtt_esp8266/mqtt_esp8266.ino
#include "Config.h" // make your own config file or remove this line and use the following lines
//const char* clientId = "smartmeter";
//const char* mqtt_server = "192.168.x.y";
//const char* ssid = "PUT-YOUR-SSID-HERE";
//const char* password = "PUT-YOUR-WIFI-PASSWORD-HERE";
//IPAddress ip(192, 168, x, y); // Static IP
//IPAddress dns(192, 168, x, y); // most likely your router
//IPAddress gateway(192, 168, x, y); // most likely your router
//IPAddress subnet(255, 255, 255, 0);
byte inByte; // for reading from serial
byte smlMessage[700]; // for storing the the isolated message. Mine was 280 bytes, but may vary...
const byte startSequence[] = { 0x1B, 0x1B, 0x1B, 0x1B, 0x01, 0x01, 0x01, 0x01 }; // see sml protocol
const byte stopSequence[] = { 0x1B, 0x1B, 0x1B, 0x1B, 0x1A };
bool connectedToMQTT = false;
int smlIndex; // represents the actual position in smlMessage
int startIndex; // for counting startSequence hits
int stopIndex; // for counting stopSequence hits
int stage; // defines what to do next. 0 = searchStart, 1 = searchStop, 2 = publish message
SoftwareSerial infraredHead( RX_PIN, TX_PIN, false, 256); // RX, TX, Inverse, Buffer
WiFiClient espClient;
PubSubClient mqttClient(espClient);
void setup_wifi() {
delay(10);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.config(ip, dns, gateway, subnet);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void mqttCallback(char* topic, byte* payload, unsigned int length) {
// not used in this example
}
void mqttReconnect() {
// Loop until we're reconnected
while (!mqttClient.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (mqttClient.connect(clientId)) {
Serial.println("connected");
// Once connected, publish an announcement...
char* topic = "/energy/status";
char* path = (char *) malloc(1 + strlen(clientId) + strlen(topic) );
strcpy(path, clientId);
strcat(path, topic);
mqttClient.publish(path, "online");
// ... and resubscribe
//mqttClient.subscribe("smartmeter/inTopic");
} else {
Serial.print("failed, rc=");
Serial.print(mqttClient.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
Serial.begin(115200);
Serial.println("\nHardware serial started");
infraredHead.begin(9600);
Serial.println("\nSoftware serial started");
setup_wifi();
mqttClient.setServer(mqtt_server, 1883);
mqttClient.setCallback(mqttCallback);
// --------------------------------------------------------------------- OTA
// Port defaults to 8266
// ArduinoOTA.setPort(8266);
// Hostname defaults to esp8266-[ChipID]
ArduinoOTA.setHostname(clientId);
// No authentication by default
ArduinoOTA.setPassword((const char *)"08154711");
ArduinoOTA.onStart([]() {
Serial.println("Start");
});
ArduinoOTA.onEnd([]() {
Serial.println("\nEnd");
});
ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
});
ArduinoOTA.onError([](ota_error_t error) {
Serial.printf("Error[%u]: ", error);
if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
else if (error == OTA_END_ERROR) Serial.println("End Failed");
});
ArduinoOTA.begin();
}
void loop() {
ArduinoOTA.handle();
if (!mqttClient.connected()) {
mqttReconnect();
}
mqttClient.loop();
switch (stage) {
case 0:
findStartSequence();
break;
case 1:
findStopSequence();
break;
case 2:
publishMessage();
break;
}
}
void findStartSequence() {
while (infraredHead.available())
{
inByte = infraredHead.read();
if (inByte == startSequence[startIndex])
{
smlMessage[startIndex] = inByte;
startIndex++;
if (startIndex == sizeof(startSequence))
{
stage = 1;
smlIndex = startIndex;
startIndex = 0;
}
}
else {
startIndex = 0;
}
}
}
void findStopSequence() {
while (infraredHead.available())
{
inByte = infraredHead.read();
smlMessage[smlIndex] = inByte;
smlIndex++;
if (inByte == stopSequence[stopIndex])
{
stopIndex++;
if (stopIndex == sizeof(stopSequence))
{
stage = 2;
stopIndex = 0;
// after the stop sequence, ther are sill 3 bytes to come.
// One for the amount of fillbytes plus two bytes for calculating CRC.
delay(30); // wait for the 3 bytes
for (int c = 0 ; c < 3 ; c++) {
smlMessage[smlIndex++] = infraredHead.read();
}
smlIndex--;
}
}
else {
stopIndex = 0;
}
}
}
void publishMessage() {
int arrSize = 2 * smlIndex + 1;
char smlMessageAsString[arrSize];
char *myPtr = &smlMessageAsString[0]; //or just myPtr=charArr; but the former described it better.
for (int i = 0; i <= smlIndex; i++) {
snprintf(myPtr, 3, "%02x", smlMessage[i]); //convert a byte to character string, and save 2 characters (+null) to charArr;
myPtr += 2; //increment the pointer by two characters in charArr so that next time the null from the previous go is overwritten.
}
//Serial.println(smlMessageAsString); // for debuging
char* topic = "/energy/sml";
char* path = (char *) malloc(1 + strlen(clientId) + strlen(topic) );
strcpy(path, clientId);
strcat(path, topic);
mqttClient.publish(path, smlMessageAsString);
memset(smlMessage, 0, sizeof(smlMessage)); // clear the buffer
smlIndex = 0;
stage = 0; // start over
}