@signalk/nmea0183-signalk
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A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.
154 lines • 5.75 kB
JavaScript
"use strict";
/**
* Copyright 2016 Signal K <info@signalk.org> and contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
const utils = __importStar(require("@signalk/nmea0183-utilities"));
/*
* MDA - Meteorological Composite
*
* 1 2 3 4 5 6 7 8 9 10 11 12
* | | | | | | | | | | | |
* $--MDA,x.x,I,x.x,B,x.x,C,x.x,C,x.x,x.x,x.x,C,x.x,T,x.x,M,x.x,N,x.x,M*hh<CR><LF>
* Field Number:
* 1. Barometric pressure, inches of mercury
* 2. Barometric pressure, bars
* 3. Air temperature, deg Celsius
* 4. Water temperature, deg Celsius
* 5. Relative humidity, percent
* 6. Absolute humidity, percent <-- absolute is usually density, but NMEA probably using less common mass water per mass atmosphere formulation
* 7. Dew point, deg Celsius
* 8. Wind direction, degress True
* 9. Wind direction, degress Magnetic
* 10. Wind speed, knots
* 11. Wind speed, m/s
* 12. Checksum
*/
const MDA = function (input, _session) {
const { parts, tags } = input;
const values = [];
// make SI units override any non-SI units
if (parts[0] !== '') {
values.push({
path: 'environment.outside.pressure',
value: 3386.3886666667 * utils.float(parts[0]) // converting inHg -> Pa (SI units)
});
}
if (parts[2] !== '') {
values.push({
path: 'environment.outside.pressure',
value: utils.float(parts[2]) * 100000.0 // converting from bars to Pa (SI units)
});
}
if (parts[4] !== '') {
values.push({
path: 'environment.outside.temperature',
value: utils.transform(utils.float(parts[4]), 'c', 'k') // transform units Celsius to Kelvin (stick to SI units)
});
}
if (parts[6] !== '') {
values.push({
path: 'environment.water.temperature',
value: utils.transform(utils.float(parts[6]), 'c', 'k') // transform units Celsius to Kelvin (stick to SI units)
});
}
if (parts[8] !== '') {
values.push({
path: 'environment.outside.humidity',
value: utils.float(parts[8]) / 100.0 // converting from precentage to fraction
});
}
if (parts[9] !== '') {
values.push({
path: 'environment.outside.humidityAbsolute',
value: utils.float(parts[9]) / 100.0 // NMEA docs suggest this is a fraction/percentage, so probably they mean mass water per mass atmosphere formulation
});
}
if (parts[10] !== '') {
values.push({
path: 'environment.outside.dewPointTemperature',
value: utils.transform(utils.float(parts[10]), 'c', 'k')
});
}
if (parts[12] !== '') {
values.push({
path: 'environment.wind.directionTrue',
value: utils.transform(utils.float(parts[12]), 'deg', 'rad')
});
}
if (parts[14] !== '') {
values.push({
path: 'environment.wind.directionMagnetic',
value: utils.transform(utils.float(parts[14]), 'deg', 'rad')
});
}
if (parts[16] !== '') {
values.push({
path: 'environment.wind.speedOverGround',
value: utils.transform(utils.float(parts[16]), 'knots', 'ms')
});
}
if (parts[18] !== '') {
values.push({
path: 'environment.wind.speedOverGround',
value: utils.float(parts[18])
});
}
const delta = {
updates: [
{
source: tags.source,
timestamp: tags.timestamp,
values: values
}
]
};
return delta;
};
exports.default = MDA;
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