Create initial model classes

server/Models/RSSI.mjs

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+"use strict";
+
+/**
+ * The received signal strength of a message from a single gateway.
+ * @param	{string}	id			The id of this rssi measurement.
+ * @param	{number}	gateway_id	The id of this gateway.
+ * @param	{number}	rssi		The rssi measurement.
+ */
+class RSSI {
+	constructor(id, gateway_id, rssi) {
+		this.id = id;
+		this.gateway_id = gateway_id;
+		this.rssi = rssi;
+	}
+}
+
+export default RSSI;

server/Models/Reading.mjs

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+"use strict";
+
+import RSSI from './RSSI.mjs';
+
+/**
+ * A single data reading received over the TTN.
+ * @param	{string}	id		The id of this reading.
+ * @param	{number}	lat		The latitude at which this reading was taken.
+ * @param	{number}	long	The longitude at which this reading was taken.
+ * @param	{RSSI[]}	rssis	An array of RSSI objects containing the signal strengths, as reported by 1 or mroe gateways.
+ */
+class Reading {
+	constructor(id, lat, long, rssis) {
+		/** @type {string} */
+		this.id = id;
+		/** @type {number} */
+		this.lat = lat;
+		/** @type {number} */
+		this.long = long;
+		/** @type {RSSI[]} */
+		this.rssis = rssis;
+	}
+	
+	/**
+	 * Returns the RSSI reading for the strongest received signal strength.
+	 * @return {RSSI|null} The RSSI object that contains the strongest received signal strength.
+	 */
+	get best_rssi() {
+		if(this.rssis.length == 0)
+			return null;
+		
+		return this.rssis.reduce(
+			(prev, next) => prev.rssi > next.rssi ? prev : next,
+			this.rssis[0]
+		);
+	}
+}
+
+export default Reading;