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RichardKroesenRichardKroesen
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Add testing json.
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‎Decoder_test.js‎

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/**
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* Cayenne Low-power Payload Library
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*
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* @author Pasakorn Tiwatthanont
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* @email [email protected]
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*
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* @link https://htmlcheatsheet.com/js/
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*/
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// console.log('Node.js version: ' + process.version)
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format = require('string-format')
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/**
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* Byte stream to fixed-point decimal word.
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*
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* @param stream: array of bytes.
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* @return: word of the bytes in big-endian format.
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*/
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function arrayToDecimal(stream, is_signed=false, decimal_point=0) {
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var value = 0;
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for (var i = 0; i < stream.length; i++) {
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if (stream[i] > 0xFF)
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throw 'Byte value overflow!';
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value = (value<<8) | stream[i];
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}
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if (is_signed) {
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edge = 1 << (stream.length )*8; // 0x1000..
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max = (edge-1) >> 1; // 0x0FFF.. >> 1
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value = (value > max) ? value - edge : value;
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}
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if (decimal_point) {
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value /= Math.pow(10, decimal_point);
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}
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return value;
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}
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/**
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* Cayenne Low-power Payload Decoder
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*
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* @param payload: array of bytes.
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* @return: JSON
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*/
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function decode(payload) {
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if (payload == null)
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payload = [
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0x01, 0x67, 0x00, 0xE1, // "temperature_1" : 22.5 (fixed point)
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0x02, 0x73, 0x29, 0xEC, // "barometric_pressure_2": 1073.2 (fixed point)
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0x03, 0x88, // "gps_3":
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0x02, 0xDD, 0xFC, // { "latitude" : 18.79,
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0x0F, 0x1A, 0x68, // "longitude": 98.98,
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0x00, 0x79, 0x18, // "altitude" : 310 }
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]
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/**
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* @reference https://github.com/myDevicesIoT/cayenne-docs/blob/master/docs/LORA.md
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*
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* Type IPSO LPP Hex Data Size Data Resolution per bit
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* Digital Input 3200 0 0 1 1
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* Digital Output 3201 1 1 1 1
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* Analog Input 3202 2 2 2 0.01 Signed
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* Analog Output 3203 3 3 2 0.01 Signed
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* Illuminance Sensor 3301 101 65 2 1 Lux Unsigned MSB
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* Presence Sensor 3302 102 66 1 1
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* Temperature Sensor 3303 103 67 2 0.1 °C Signed MSB
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* Humidity Sensor 3304 104 68 1 0.5 % Unsigned
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* Accelerometer 3313 113 71 6 0.001 G Signed MSB per axis
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* Barometer 3315 115 73 2 0.1 hPa Unsigned MSB
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* Gyrometer 3334 134 86 6 0.01 °/s Signed MSB per axis
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* GPS Location 3336 136 88 9 Latitude : 0.0001 ° Signed MSB
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* Longitude : 0.0001 ° Signed MSB
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* Altitude : 0.01 meter Signed MSB
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*/
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var sensor_types = {
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0 : {'size': 1, 'name': 'Digital Input' , 'signed': false, 'decimal_point': 0,},
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1 : {'size': 1, 'name': 'Digital Output' , 'signed': false, 'decimal_point': 0,},
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2 : {'size': 2, 'name': 'Analog Input' , 'signed': true , 'decimal_point': 2,},
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3 : {'size': 2, 'name': 'Analog Output' , 'signed': true , 'decimal_point': 2,},
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101: {'size': 2, 'name': 'Illuminance Sensor' , 'signed': false, 'decimal_point': 0,},
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102: {'size': 1, 'name': 'Presence Sensor' , 'signed': false, 'decimal_point': 0,},
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103: {'size': 2, 'name': 'Temperature Sensor' , 'signed': true , 'decimal_point': 1,},
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104: {'size': 1, 'name': 'Humidity Sensor' , 'signed': false, 'decimal_point': 1,},
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113: {'size': 6, 'name': 'Accelerometer' , 'signed': true , 'decimal_point': 3,},
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115: {'size': 2, 'name': 'Barometer' , 'signed': false, 'decimal_point': 1,},
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134: {'size': 6, 'name': 'Gyrometer' , 'signed': true , 'decimal_point': 2,},
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136: {'size': 9, 'name': 'GPS Location' , 'signed': false, 'decimal_point': [4,4,2], },};
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var sensors = {};
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var i = 0;
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while (i < payload.length) {
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// console.log(i);
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// console.log(typeof payload[i])
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// console.log(payload[i].toString())
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s_no = payload[i++];
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s_type = payload[i++];
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if (typeof sensor_types[s_type] == 'undefined')
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throw format('Sensor type error!: {}', s_type);
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s_size = sensor_types[s_type].size;
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s_name = sensor_types[s_type].name;
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switch (s_type) {
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case 0 : // Digital Input
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case 1 : // Digital Output
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case 2 : // Analog Input
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case 3 : // Analog Output
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case 101: // Illuminance Sensor
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case 102: // Presence Sensor
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case 103: // Temperature Sensor
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case 104: // Humidity Sensor
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case 113: // Accelerometer
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case 115: // Barometer
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case 134: // Gyrometer
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s_value = arrayToDecimal(payload.slice(i, i+s_size),
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is_signed = sensor_types[s_type].signed,
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decimal_point = sensor_types[s_type].decimal_point);
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//console.log(format('no:{} size:{} type:{} value:{}', s_no, s_size, s_name, s_value));
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break;
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case 136: // GPS Location
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s_value = {
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'latitude': arrayToDecimal(payload.slice(i+0, i+3), is_signed=sensor_types[s_type].signed, decimal_point=sensor_types[s_type].decimal_point[0]),
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'longitude': arrayToDecimal(payload.slice(i+3, i+6), is_signed=sensor_types[s_type].signed, decimal_point=sensor_types[s_type].decimal_point[1]),
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'altitude': arrayToDecimal(payload.slice(i+6, i+9), is_signed=sensor_types[s_type].signed, decimal_point=sensor_types[s_type].decimal_point[2]),};
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//console.log(format('no:{} size:{} type:{} lat:{} lon:{} alt:{}', s_no, s_size, s_name, s_value.lat, s_value.lon, s_value.alt));
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break;
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}
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sensors[s_no] = {'type': s_type, 'type_name': s_name, 'value': s_value };
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i += s_size;
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}
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return sensors;
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}
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/**
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* Test
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*/
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function test() {
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// Test arrayToDecimal()
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arrTest = [ 0xFF ];
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console.log(arrayToDecimal(arrTest) + ' -> ' + arrayToDecimal(arrTest, is_signed=true)); // -1
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arrTest = [ 0xFF, 0xFF ];
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console.log(arrayToDecimal(arrTest) + ' -> ' + arrayToDecimal(arrTest, is_signed=true)); // -1
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// Test decode()
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console.log(decode());
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}
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test()

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