Here is the entire sketch that will run on the Nano 33 IoT:

CODE WAS MOVED HERE FROM MY BLOG ABOVE

• /* 
    Sketch generated by the Arduino IoT Cloud Thing "1554H2GYCL "
    https://create.arduino.cc/cloud/things/f6a8d66c-2702-45e7-b93a-a2d41f9bedb8 
  
    Arduino IoT Cloud Variables description
  
    The following variables are automatically generated and updated when changes are made to the Thing
  
    String water;
    float dust;
    float temp;
    int waterInt;
  
    Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
    which are called when their values are changed from the Dashboard.
    These functions are generated with the Thing and added at the end of this sketch.
  */
  
  #include "thingProperties.h"
  String inputString = "";         // a String to hold incoming data
  bool stringComplete = false;  // whether the string is complete
  
  float retFloat(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a float value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = String(stringOne.substring(firstClosingBracket+1));
  //Serial.println(value);
  float val  = value.toFloat();
     return val;
  }
  
  String retString(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a int  value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = stringOne.substring(firstClosingBracket+1);
  //Serial.println(value);
  //float val  = value.toInt();
     return value;
  }
  
  String getType(String stringOne){
    int colon = stringOne.indexOf(':');
    String value = stringOne.substring(0,colon);
    //Serial.println(value);
       return value;  
  }
  
  void setup() {
    // Initialize serial and wait for port to open:
    Serial.begin(9600);
    Serial1.begin(9600);
    
    // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
    delay(1500); 
  
    // Defined in thingProperties.h
    initProperties();
  
    // Connect to Arduino IoT Cloud
    ArduinoCloud.begin(ArduinoIoTPreferredConnection);
    //delay(3000);
    
    /*
       The following function allows you to obtain more information
       related to the state of network and IoT Cloud connection and errors
       the higher number the more granular information you’ll get.
       The default is 0 (only errors).
       Maximum is 4
   */
    setDebugMessageLevel(2);
    ArduinoCloud.printDebugInfo();
  }
  
  
  void loop() {
    ArduinoCloud.update();
    // Your code here 
    
    // use the string when a newline arrives:
    if (stringComplete) {
      Serial.print("received on RX PIN:");
      Serial.print(inputString);
  
      
      //USE THE InputString HERE
      // get the type of var
      String type = getType(inputString);
      
      if(type == "Temp"){
        temp = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(temp);
      }
      
      if(type == "Dust"){
        dust = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(dust);
      }
      
      if(type == "Water"){
        water = retString(inputString); 
        if (water == "WET\n"){
          waterInt = 0;
        }
        if (water == "DRY\n"){
          waterInt = 1;
        }
        Serial.print("Sending value = ");
        Serial.print(water);
        Serial.println(waterInt);
      }  
      
      inputString = "";
      stringComplete = false;
    }
    
    //At the very end of the loop check for serial data
    serialEvent();
    
  }
  
  /*
    SerialEvent occurs whenever a new data comes in the hardware serial RX. This
    routine is run between each time loop() runs, so using delay inside loop can
    delay response. Multiple bytes of data may be available.
  */
  void serialEvent() {
    while (Serial1.available()) {
      // get the new byte:
      char inChar = (char)Serial1.read();
      // add it to the inputString:
      
      inputString += inChar;
      // if the incoming character is a newline, set a flag so the main loop can
      // do something about it:
      if (inChar == '\n') {
        stringComplete = true;
      }
    }
  }
  /*
    Since Temp is READ_WRITE variable, onTempChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onTempChange()  {
    // Add your code here to act upon Temp change
  }
  
  /*
    Since Water is READ_WRITE variable, onWaterChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterChange()  {
    // Add your code here to act upon Water change
  }
  
  /*
    Since WaterInt is READ_WRITE variable, onWaterIntChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterIntChange()  {
    // Add your code here to act upon WaterInt change
  }
  
  /*
    Since Dust is READ_WRITE variable, onDustChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onDustChange()  {
    // Add your code here to act upon Dust change
  }

Here is the entire sketch that will run on the Nano 33 IoT:

CODE WAS MOVED HERE FROM MY BLOG ABOVE

• /* 
    Sketch generated by the Arduino IoT Cloud Thing "1554H2GYCL "
    https://create.arduino.cc/cloud/things/f6a8d66c-2702-45e7-b93a-a2d41f9bedb8 
  
    Arduino IoT Cloud Variables description
  
    The following variables are automatically generated and updated when changes are made to the Thing
  
    String water;
    float dust;
    float temp;
    int waterInt;
  
    Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
    which are called when their values are changed from the Dashboard.
    These functions are generated with the Thing and added at the end of this sketch.
  */
  
  #include "thingProperties.h"
  String inputString = "";         // a String to hold incoming data
  bool stringComplete = false;  // whether the string is complete
  
  float retFloat(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a float value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = String(stringOne.substring(firstClosingBracket+1));
  //Serial.println(value);
  float val  = value.toFloat();
     return val;
  }
  
  String retString(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a int  value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = stringOne.substring(firstClosingBracket+1);
  //Serial.println(value);
  //float val  = value.toInt();
     return value;
  }
  
  String getType(String stringOne){
    int colon = stringOne.indexOf(':');
    String value = stringOne.substring(0,colon);
    //Serial.println(value);
       return value;  
  }
  
  void setup() {
    // Initialize serial and wait for port to open:
    Serial.begin(9600);
    Serial1.begin(9600);
    
    // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
    delay(1500); 
  
    // Defined in thingProperties.h
    initProperties();
  
    // Connect to Arduino IoT Cloud
    ArduinoCloud.begin(ArduinoIoTPreferredConnection);
    //delay(3000);
    
    /*
       The following function allows you to obtain more information
       related to the state of network and IoT Cloud connection and errors
       the higher number the more granular information you’ll get.
       The default is 0 (only errors).
       Maximum is 4
   */
    setDebugMessageLevel(2);
    ArduinoCloud.printDebugInfo();
  }
  
  
  void loop() {
    ArduinoCloud.update();
    // Your code here 
    
    // use the string when a newline arrives:
    if (stringComplete) {
      Serial.print("received on RX PIN:");
      Serial.print(inputString);
  
      
      //USE THE InputString HERE
      // get the type of var
      String type = getType(inputString);
      
      if(type == "Temp"){
        temp = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(temp);
      }
      
      if(type == "Dust"){
        dust = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(dust);
      }
      
      if(type == "Water"){
        water = retString(inputString); 
        if (water == "WET\n"){
          waterInt = 0;
        }
        if (water == "DRY\n"){
          waterInt = 1;
        }
        Serial.print("Sending value = ");
        Serial.print(water);
        Serial.println(waterInt);
      }  
      
      inputString = "";
      stringComplete = false;
    }
    
    //At the very end of the loop check for serial data
    serialEvent();
    
  }
  
  /*
    SerialEvent occurs whenever a new data comes in the hardware serial RX. This
    routine is run between each time loop() runs, so using delay inside loop can
    delay response. Multiple bytes of data may be available.
  */
  void serialEvent() {
    while (Serial1.available()) {
      // get the new byte:
      char inChar = (char)Serial1.read();
      // add it to the inputString:
      
      inputString += inChar;
      // if the incoming character is a newline, set a flag so the main loop can
      // do something about it:
      if (inChar == '\n') {
        stringComplete = true;
      }
    }
  }
  /*
    Since Temp is READ_WRITE variable, onTempChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onTempChange()  {
    // Add your code here to act upon Temp change
  }
  
  /*
    Since Water is READ_WRITE variable, onWaterChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterChange()  {
    // Add your code here to act upon Water change
  }
  
  /*
    Since WaterInt is READ_WRITE variable, onWaterIntChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterIntChange()  {
    // Add your code here to act upon WaterInt change
  }
  
  /*
    Since Dust is READ_WRITE variable, onDustChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onDustChange()  {
    // Add your code here to act upon Dust change
  }