Sample Decoder for Payload of LoRaWAN Sensor

WSLRW-MN-EN

APR-2020

Sample Decoder for Payload of LoRaWAN Sensor

THIS IS OBSOLETE MANUAL

Please access https://www.iot.daviteq.com/wireless-sensors for updated manual

1. Decoder sample

You can download HERE

/* ******************************************
* bytes to number
* https://docs.microsoft.com/en-us/cpp/cpp/data-type-ranges?view=msvc-160
********************************************/
function bytesToFloat(bytes) {
// Reference link:https://stackoverflow.com/a/37471538 by Ilya Bursov
var bits = bytes[0]<<24 | bytes[1]<<16 | bytes[2]<<8 | bytes[3];
var sign = (bits>>>31 === 0) ? 1.0 : -1.0;
var e = bits>>>23 & 0xff;
var m = (e === 0) ? (bits & 0x7fffff)<<1 : (bits & 0x7fffff) | 0x800000;
var f = sign * m * Math.pow(2, e - 150);
return f;
}
function bytesToUnsignedInt32(bytes) {
var v = bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3];
return v;
}
function bytesToInt32(bytes) {
// 0...31: representation bits
// 31: sign bit
var v = bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3];
return v > 0x7FFFFFFF ? v - 0x0100000000 : v;
}
function bytesToUnsignedInt8(bytes) {
var v = bytes[0];
return v;
}
function bytesToInt8(bytes) {
// 0...7: representation bits
// 8: sign bit
var v = bytes[0];
return v > 0x7f ? v - 0x0100 : v;
}
function bytesToUnsignedInt16(bytes) {
var v = bytes[0] << 8 | bytes[1];
return v;
}
function bytesToInt16(bytes) {
// 0...14: representation bits
// 15: sign bit
var v = (bytes[0] << 8) | bytes[1];
return v > 0x7fff ? v - 0x010000 : v;
}
/**----------------------------------**/

/**------GLOBIOTS SENSOR TYPE-------**/
var I2C_ATE_SENSOR_TYPE = 0x01;
var I2C_ATH_SENSOR_TYPE = 0x02;
var I2C_PPS_SENSOR_TYPE = 0x04;
var SMT01_SENSOR_TYPE = 0x0C;
var LIQUID_LEVEL_SENSOR_TYPE = 0x0E;
var I2C_TILT_SENSOR_TYPE = 0x0D;
/**--------------------------------**/
var STATUS_BATTERY_BIT_MASK = 0xC0;
var STATUS_ERROR_BIT_MASK = 0x30;
var STATUS_ALARM_1_BIT_MASK = 0x0C;
var STATUS_ALARM_2_BIT_MASK = 0x03;
var STATUS_ALARM_3_BIT_MASK = 0x03;

var GLOBIOTS_DEFINED_DATA = {};
var listParameterMapping = [];
var sensorType = bytes[0];
var batteryLevel = (bytes[1] & STATUS_BATTERY_BIT_MASK) >> 6;
var sensorError = (bytes[1] & STATUS_ERROR_BIT_MASK) >> 4;
var parameter1Alarm = (bytes[1] & STATUS_ALARM_1_BIT_MASK) >> 2; //1st - Parameter alarm status
var parameter2Alarm = bytes[1] & STATUS_ALARM_2_BIT_MASK; //2nd - Parameter alarm status

/**-----------------------GLOBIOTS MAPPING DATA-----------------------**/
var parameterMapping = {};
parameterMapping["PARAMETER_6000"] = batteryLevel;
parameterMapping["PARAMETER_6006"] = sensorError;
parameterMapping["PARAMETER_6007"] = sensorType;

if(sensorType === I2C_ATE_SENSOR_TYPE){
var temperature = bytesToFloat(bytes.slice(2, 6)); //1st - Parameter

parameterMapping["PARAMETER_6002"] = temperature;
parameterMapping["ALARM_6002"] = parameter1Alarm;
} else if(sensorType === I2C_ATH_SENSOR_TYPE){
var humidity = bytesToFloat(bytes.slice(2, 6)); //1st - Parameter
var temperature = bytesToFloat(bytes.slice(6, 11)); //2nd - Parameter

parameterMapping["PARAMETER_6002"] = humidity;
parameterMapping["PARAMETER_6008"] = temperature;
parameterMapping["ALARM_6002"] = parameter1Alarm;
parameterMapping["ALARM_6008"] = parameter2Alarm;
} else if(sensorType === I2C_PPS_SENSOR_TYPE){
var processPressure = bytesToFloat(bytes.slice(2, 6)); //1st - Parameter
var temperature = bytesToFloat(bytes.slice(6, 11)); //2nd - Parameter

parameterMapping["PARAMETER_6002"] = processPressure;
parameterMapping["PARAMETER_6008"] = temperature;
parameterMapping["ALARM_6002"] = parameter1Alarm;
parameterMapping["ALARM_6008"] = parameter2Alarm;
} else if(sensorType === SMT01_SENSOR_TYPE){
var soilMoisture = bytesToFloat(bytes.slice(2, 4)); //1st - Parameter
var temperature = bytesToFloat(bytes.slice(4, 6)); //2nd - Parameter

parameterMapping["PARAMETER_6002"] = soilMoisture;
parameterMapping["PARAMETER_6008"] = temperature;
parameterMapping["ALARM_6002"] = parameter1Alarm;
parameterMapping["ALARM_6008"] = parameter2Alarm;
} else if(sensorType === LIQUID_LEVEL_SENSOR_TYPE){
var level = bytesToUnsignedInt16(bytes.slice(2, 4)); //1st - Parameter
var distance = bytesToUnsignedInt16(bytes.slice(4, 6)); //1st - Parameter

parameterMapping["PARAMETER_6002"] = level;
parameterMapping["PARAMETER_6008"] = distance;
parameterMapping["ALARM_6002"] = parameter1Alarm;
parameterMapping["ALARM_6008"] = parameter2Alarm;
} else if(sensorType === I2C_TILT_SENSOR_TYPE){
var parameter3Alarm = bytes[2] & STATUS_ALARM_3_BIT_MASK;
var realX = bytesToInt16(bytes.slice(3, 5)) / 10 ; //1st - Parameter
var realY = bytesToInt16(bytes.slice(5, 7)) / 10; //2nd - Parameter
var realZ = bytesToInt16(bytes.slice(7, 9)) / 10; //3rd - Parameter
parameterMapping["PARAMETER_6002"] = realX;
parameterMapping["PARAMETER_6008"] = realY;
parameterMapping["PARAMETER_6ACD"] = realZ;
parameterMapping["ALARM_6002"] = parameter1Alarm;
parameterMapping["ALARM_6008"] = parameter2Alarm;
parameterMapping["ALARM_6ACD"] = parameter3Alarm;
}

listParameterMapping.push(parameterMapping);
/**------------------------------------------------------------------**/
GLOBIOTS_DEFINED_DATA['parameterMappings'] = listParameterMapping;
return GLOBIOTS_DEFINED_DATA;

2. Place to write decoder

3. Test decoder

Write in the payload you need to decode and then run the test

4. Support contacts