raddec
Version:
Protocol-agnostic RADio DECoding packet library. We believe in an open Internet of Things.
59 lines (50 loc) • 1.82 kB
JavaScript
/**
* Copyright reelyActive 2018-2026
* We believe in an open Internet of Things
*/
const identifiers = require('./identifiers');
/**
* Merge the source rssiSignature into the destination rssiSignature.
* @param {Array} source The source rssiSignature.
* @param {Array} destination The destination rssiSignature.
*/
function merge(source, destination) {
source.forEach((current) => {
let isMatchFound = false;
destination.forEach((target) => {
let isSameReceiver = identifiers.areReceiverMatch(current.receiverId,
current.receiverIdType,
current.receiverAntenna,
target.receiverId,
target.receiverIdType,
target.receiverAntenna);
if(isSameReceiver) {
target.rssiSum = target.rssiSum ||
(target.rssi * target.numberOfDecodings);
target.numberOfDecodings += current.numberOfDecodings || 1;
target.rssiSum += current.rssiSum ||
(current.rssi * current.numberOfDecodings);
target.rssi = Math.round(target.rssiSum / target.numberOfDecodings);
isMatchFound = true;
}
});
if(!isMatchFound) {
destination.push(current);
}
});
destination.sort(compareRssi);
}
/**
* Compare rssi values for array sorting.
* @param {Object} a An rssiSignature entry.
* @param {Object} b Another rssiSignature entry.
*/
function compareRssi(a,b) {
if(a.rssi < b.rssi)
return 1;
if(a.rssi > b.rssi)
return -1;
return 0;
}
module.exports.merge = merge;
module.exports.compareRssi = compareRssi;