jdz/modbus_gps.py

import RPi.GPIO as GPIO
import paho.mqtt.client as mqtt
import os
import minimalmodbus
import time
import serial
from datetime import datetime
from influxdb_client import InfluxDBClient, Point
from influxdb_client.client.write_api import SYNCHRONOUS
import logging

# Set up logging
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

# GPIO configuration
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.cleanup()

# MQTT Broker settings
mqttBroker = "65.108.199.212"
myhost = os.uname()[1]
mqtt_client = mqtt.Client(myhost)
mqtt_client.connect(mqttBroker, 1883)

# Modbus configuration
preferred_device = '/dev/ttyUSB0'
fallback_device = '/dev/ttyUSB5'
device_path = preferred_device if os.path.exists(preferred_device) else fallback_device
modbus_device = '/dev/modbus'

mb_address = 1
sensy_boi = minimalmodbus.Instrument(modbus_device, mb_address)
sensy_boi.serial.baudrate = 9600
sensy_boi.serial.bytesize = 8
sensy_boi.serial.parity = minimalmodbus.serial.PARITY_NONE
sensy_boi.serial.stopbits = 1
sensy_boi.serial.timeout = 0.5
sensy_boi.mode = minimalmodbus.MODE_RTU
sensy_boi.clear_buffers_before_each_transaction = True
sensy_boi.close_port_after_each_call = True

# GPS configuration
try:
    gps_ser = serial.Serial('/dev/ttyUSB3', 115200)
    gps_ser.flushInput()
except serial.SerialException as e:
    logging.error(f"Failed to open GPS serial port: {e}")
    exit(1)

# InfluxDB settings
INFLUXDB_URL = "http://100.64.0.24:8086"
INFLUXDB_TOKEN = "IPtqPXbaXuuMHvx_tUOt1cmIZfLHucd-9DcepXTVpQc-fNKBhp6pkhyTsq_XnoGXdxwILy5AFFgZ_QUZCE5Jhg=="
INFLUXDB_ORG = "juandiego"
INFLUXDB_BUCKET = "gpsdata"

# Initialize InfluxDB client
try:
    influx_client = InfluxDBClient(url=INFLUXDB_URL, token=INFLUXDB_TOKEN, org=INFLUXDB_ORG)
    write_api = influx_client.write_api(write_options=SYNCHRONOUS)
    logging.info("Successfully connected to InfluxDB")
except Exception as e:
    logging.error(f"Failed to connect to InfluxDB: {e}")
    exit(1)

# GPIO pin configuration
PIN_17 = 17
LuzPuerta = 18
LuzEncendido = 25
GPIO.setup(PIN_17, GPIO.IN)
GPIO.setup(LuzPuerta, GPIO.OUT)
GPIO.setup(LuzEncendido, GPIO.OUT)

# Keep LuzEncendido HIGH while the program is running
GPIO.output(LuzEncendido, GPIO.HIGH)

# List to store pending data
pending_data = []

def control_gpio():
    status_17 = GPIO.input(PIN_17)
    if status_17 == GPIO.LOW:
        GPIO.output(LuzPuerta, GPIO.HIGH)  # Red light on
    else:
        GPIO.output(LuzPuerta, GPIO.LOW)
    return status_17

def parse_gps_data(gps_string):
    parts = gps_string.split(',')
    if len(parts) < 4:
        logging.warning(f"Incomplete GPS data: {gps_string}")
        return None
    
    try:
        lat = float(parts[0][:2]) + float(parts[0][2:]) / 60
        if parts[1] == 'S':
            lat = -lat
        
        lon = float(parts[2][:3]) + float(parts[2][3:]) / 60
        if parts[3] == 'W':
            lon = -lon
        
        return lat, lon
    except Exception as e:
        logging.error(f"Error parsing GPS data: {e}")
        return None

def write_to_influxdb(lat, lon):
    timestamp = int(time.time() * 1000000000)  # nanosecond precision
    
    try:
        gps_point = Point("gps_location") \
            .tag("host", myhost) \
            .field("latitude", lat) \
            .field("longitude", lon) \
            .field("geolocation", f"{lat},{lon}") \
            .time(timestamp)
        
        write_api.write(bucket=INFLUXDB_BUCKET, record=gps_point)
        logging.info(f"GPS data written to InfluxDB: Lat: {lat}, Lon: {lon}")
    except Exception as e:
        logging.error(f"Failed to write GPS data to InfluxDB: {e}")

def send_at(command, back, timeout):
    try:
        gps_ser.write((command + '\r\n').encode())
        time.sleep(timeout)
        if gps_ser.inWaiting():
            time.sleep(0.01)
            rec_buff = gps_ser.read(gps_ser.inWaiting()).decode()
            if back in rec_buff:
                gps_data = rec_buff.split('+CGPSINFO: ')[1].split('\r\n')[0]
                logging.debug(f"Raw GPS data: {gps_data}")
                parsed_data = parse_gps_data(gps_data)
                if parsed_data:
                    lat, lon = parsed_data
                    logging.info(f"GPS: Lat: {lat:.6f}, Lon: {lon:.6f}")
                    write_to_influxdb(lat, lon)
                    return 1
            else:
                logging.warning(f"Expected GPS response not found. Received: {rec_buff}")
        else:
            logging.warning("No data received from GPS module")
    except Exception as e:
        logging.error(f"Error communicating with GPS module: {e}")
    return 0

def get_gps_position():
    return send_at('AT+CGPSINFO', '+CGPSINFO:', 1)

def initialize_gps():
    logging.info('Starting GPS')
    if send_at('AT+CGPS=1', 'OK', 1):
        logging.info("GPS module initialized successfully")
    else:
        logging.error("Failed to initialize GPS module")
    time.sleep(2)

# Initialize GPS
initialize_gps()

try:
    while True:
        # Control GPIO without delay
        status_17 = control_gpio()

        # Read data from Modbus sensor
        try:
            data = sensy_boi.read_registers(0, 2)
            hum = data[0] / 10
            temp = data[1] / 10

            # Data to publish
            payload = {
                "temperature": temp,
                "humidity": hum,
                "door_status": str(status_17)
            }

            try:
                # Try to publish current data
                mqtt_client.publish(f"iiot/{myhost}/temperature", temp)
                mqtt_client.publish(f"iiot/{myhost}/humidity", hum)
                mqtt_client.publish(f"iiot/{myhost}/door/pin17", str(status_17))

                # Try to publish pending data
                for item in pending_data:
                    mqtt_client.publish(f"iiot/{myhost}/temperature", item["temperature"])
                    mqtt_client.publish(f"iiot/{myhost}/humidity", item["humidity"])
                    mqtt_client.publish(f"iiot/{myhost}/door/pin17", item["door_status"])
                pending_data.clear()  # Clear the list if all data was published

            except Exception as e:
                logging.error(f"Error publishing data to MQTT: {str(e)}")
                pending_data.append(payload)  # Save data in memory

            # Print processed data
            logging.info("-------------------------------------")
            logging.info(f"Temperature = {temp}\u00B0C")
            logging.info(f"Relative humidity = {hum}%")
            logging.info(f"Door status (PIN 17) = {status_17}")
            logging.info("-------------------------------------")

        except Exception as e:
            logging.error(f"Error reading Modbus data: {str(e)}")

        # Get GPS position
        if not get_gps_position():
            logging.warning("Failed to get GPS position")

        time.sleep(30)

except KeyboardInterrupt:
    logging.info("Program interrupted by user")
except Exception as e:
    logging.error(f"Unexpected error: {str(e)}")
finally:
    GPIO.cleanup()
    gps_ser.close()
    influx_client.close()
    logging.info("Program finished")