// Decode decodes an array of bytes into an object.
//  - fPort contains the LoRaWAN fPort number
//  - bytes is an array of bytes, e.g. [225, 230, 255, 0]
//  - variables contains the device variables e.g. {"calibration": "3.5"} (both the key / value are of type string)
// The function must return an object, e.g. {"temperature": 22.5}
function Decode(fPort, bytes, variables) {
  // O5 Door contact sensor
  if (fPort === 4) {
  	return [
      {
        led_state: bytes[0]===0 ? "Off":"On",
        mtm_code_1: bytes[1],  
        mtm_code_2: bytes[2],  
        hw_code: bytes[3],
        battery_level: bytes[4]+"%",
        size_value: bytes[5],      
        door_state: bytes[6] === 1 ? "Closed": "Open",
      }
    ];
  }
  // heart-beat of O5
  else if (fPort === 5) {
    return [
      {
       led_state: (bytes[0] & 0x7f) === 0 ? "Off" : "On",
       battery_level: bytes[1] + " %",
       }
    ];
  }
  // R4 soap/sanitizer sensor
  else if (fPort === 7) {
    return [
      {
        led_state: bytes[0]===0 ? "Off":"On",
        mtm_code_1: bytes[1],  
        mtm_code_2: bytes[2],  
        hw_code: bytes[3],
        battery_level: bytes[4]+"%",
        size_value: bytes[5],      
        measure_tech:bytes[6] === 0? "Capacitive":"Other",
        liquid_level_event: bytes[7] === 0? "Liquid Detected":"No Liquid",
      }
    ];
  }
  // R4 soap/sanitizer heart-beat
  else if (fPort === 8) {
    return [
      {
       led_state: (bytes[0] & 0x7f) === 0 ? "Off" : "On",
       battery_level: bytes[1] + " %",
      }
    ];
  }
  // R1D dual roll toilet paper sensor
  else if (fPort === 57) {
    return [
      { 
        led_state:bytes[0]===0 ? "Off":"On",
        mtm_code_1:bytes[1],  
        mtm_code_2:bytes[2],  
        hw_code:bytes[3],
        battery_level:bytes[4]+"%",
        size_value:bytes[5], 
        distance_1_mm:bytes[6]*256+bytes[7],
        distance_2_mm:bytes[8]*256+bytes[9],
        distance_unit: "mm",
     }
    ];
  }
    // R1D, Heart-beat 
    else if (fPort === 58) {
      return [
        {
         led_state: (bytes[0] & 0x7f) === 0 ? "Off" : "On",
         battery_level: bytes[1] + " %",
        }
      ];
    }
  // R5 waste bin sensor
  else if (fPort === 11) {
    return [
      {
        led_state:bytes[0]===0 ? "Off":"On",
        mtm_code_1:bytes[1],  
        mtm_code_2:bytes[2],  
        hw_code:bytes[3],
        battery_level:bytes[4]+"%",
        size_value:bytes[5],      
        distance_mm: bytes[6]*256 + bytes[7],
        distance_unit: "mm",
     }
   ];
  }
 // R5, Heart-beat 
    else if (fPort === 12) {
      return [
        {
         led_state: (bytes[0] & 0x7f) === 0 ? "Off" : "On",
         battery_level: bytes[1] + " %",
        }
      ];
    }

  
}