CurrentCost_ESP8266.pde

#include <SoftwareSerial.h>

#define PUSHINTERVAL 10

SoftwareSerial mySerial = SoftwareSerial(4, 14);
byte readByte = 0xFF;
byte pinState = 0;
char startPattern[] = "<ch1><watts>";
char endPattern[] = "<";
int state = 0;
int pos = 0;
int power = 0;
int powerLast = 0;

static uint32_t timer;


void setup() {
  mySerial.begin(9600);
  Serial.begin(115200);
  
  Serial.println("Starting up");
}

void loop() {
    readByte = mySerial.read();
  if (readByte == 0xFF) {
  }
  else { 
    //Serial.print(readByte, BYTE);
    gotByte();
  }  
  if (millis() > timer) {
    timer = millis() + (PUSHINTERVAL * 1000);
    Serial.println(powerLast);
  }
  
}

/// current cost
void gotByte() {
  if (state == 0) {
    if (readByte == startPattern[pos]) {
      ++pos;
      if (startPattern[pos] == 0) {
        // finished matching start pattern
        ++state;
        power = 0;
      }
    }
    else {
      pos = 0;
    }
  }
  else if (state == 1) {
    if (readByte == endPattern[0]) {
      // finished reading power
      powerLast = power;
      state = 0;
    } else {
    // read another digit
      power = power * 10 + readByte - '0';
    }
  }
}