# Function:
#   Solar soil moisture sensor with 18650 LI battery with charger and power supply 3.3V
#   For power save, the microcontroller shall enter the deep sleep and switch of the power supplier of the soil moisture sensor via transistor or (GPIO Output Pin=Pull-UP)
#       Subfunction: Battery voltage sensor for battery state monitoring
#   Connect to the ioBroker via MQTT and send values: soil moisture sensor and Battery voltage as raw value. Further function via node-red
# Function Sequence:
#   1.) Load required modules for the simple work 
#   2.) Configure required HW pin, LED, Transistor etc.
#   3.) Connect WLAN
#   4.) Connect MQTT
#   5.) LED blink for visual indication that the system is alive
#   6.) Deep sleep for 1 hour (or 2 hour -> soil moisture don't change the value in a fast manner)
# Reqeat the sequence until we all getting old :-)
#
# Further Information  
#   Deep Sleep is working with full reset
#   Several example don't work
#   Don't work:
#       https://wokwi.com/projects/389514828405174273
#           Scheduler and deep sleep combination are not working
#       https://wokwi.com/projects/389622799443898369
#           rtc.irq is not supported
#   Further references for this code
#       https://docs.micropython.org/en/latest/esp32/quickref.html#deep-sleep-mode

# *****************************************************************************************
# ******************** Import libraries ***************************************************
# *****************************************************************************************
import machine
from machine import Pin
from time import sleep
import esp32
import network

# Start Program code
print("")
print("Start program....")

# *****************************************************************************************
# ******************** HW Pin configuration ***********************************************
# *****************************************************************************************

led = Pin (2, Pin.OUT)       #GPIO2 as output for LED
opin = Pin(19, Pin.OUT, value=1, hold=True) # hold output level
ipin = Pin(21, Pin.IN, Pin.PULL_UP, hold=True) # hold pull-up
print("HW Pin Configuration: Done")

# enable pad hold in deep-sleep for non-RTC GPIO
esp32.gpio_deep_sleep_hold(True)

# *****************************************************************************************
# ******************** WLAN ***************************************************************
# *****************************************************************************************

# Connection Info
SSID="Wokwi-GUEST"
WIFIPASS=""

print("Connect to Network", end="") # end="" --> Keine neue Zeile anfangen
wlan = network.WLAN(network.STA_IF)
wlan.active(True)                      # WLAN-Adapter switch on

wlan.connect(SSID, WIFIPASS)           # Connect with network

while not wlan.isconnected():
    print(".", end="")
    sleep(0.1)
print(" WLAN connected !")    

# *****************************************************************************************
# ******************** MQTT ***************************************************************
# *****************************************************************************************
from umqtt.simple import MQTTClient

MQTT_CLIENT_ID  = "richards-publisher"
MQTT_BROKER     = "mqtt.chaos4all.de"
MQTT_USER       = "student"
MQTT_PW         = "Pa55w.rd"
MQTT_TOPIC      = "lf07/richard"

# mqtt-Verbindungsparameter
print("Verbinde mit MQTT-Broker ............ ", end="")
mqtt = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PW)

# Verbindung herstellen
mqtt.connect()
print(" MQTT Verbunden")

# *****************************************************************************************
# ******************** Hello world blink **************************************************
# *****************************************************************************************
print("LED Blink: Start")
led.value(1)                 #LED is ON
sleep(1)                     #delay of 1 second
led.value(0)                 #LED is OFF
sleep(1)                     #delay of 1 second
print("LED Blink: Done")

# wait 5 seconds so that you can catch the ESP awake to establish a serial communication later
# you should remove this sleep line in your final script
sleep(5)                    #delay of 10 seconds

# *****************************************************************************************
# ******************** Deep Sleep *********************************************************
# *****************************************************************************************
print("Going into Deep Sleep Mode")
machine.deepsleep(10000)     # 10000ms sleep time

# *****************************************************************************************