Make 16 char telemetry ID actually 16 chars

lib/Telemetry.js

@@ -75,9 +75,18 @@ module.exports = class Telemetry extends Homey.SimpleClass {
 
 		if (!uid) {
 			// 16 semi-random hexadecimal nibbles
-			uid = ((new Date()).getTime().toString(16) + Math.random().toString(16).slice(2)).slice(16);
+			uid = ((new Date()).getTime().toString(16) + Math.random().toString(16).slice(2)).slice(0, 16);
 			Homey.ManagerSettings.set('telemetryId', uid);
 		}
+
+		// A smart developer can set their own 'username' but cid must be 16 char hex
+		if (!this.cid) {
+			this.cid = uid;
+			if (!/^[0-9a-zA-Z]{16}$/.test(this.cid)) {
+				this.cid = Array.from(this.uid).reduce((p, c) => p + c.charCodeAt(0).toString(16), '').slice(0, 16).padEnd(16, 0);
+			}
+		}
+
 		return uid;
 	}
 
@@ -220,6 +229,7 @@ module.exports = class Telemetry extends Homey.SimpleClass {
 
 		this.sending = true;
 		const now = new Date();
+
 		try {
 			url = url.replace(/^\//, '');
 			metrics = {
@@ -228,6 +238,7 @@ module.exports = class Telemetry extends Homey.SimpleClass {
 				url: `https://${this.host}/${url}`,
 				...metrics,
 				uid: this.uid,
+				cid: this.cid,
 				idsite: this.siteId,
 
 				lang: Homey.ManagerI18n.getLanguage(),