add sensor telemetry example

examples/get_sensor_telemetry.js

@@ -0,0 +1,50 @@
+import TCPConnection from "../src/connection/tcp_connection.js";
+import CayenneLpp from "../src/cayenne_lpp.js";
+
+// create connection
+const connection = new TCPConnection("10.1.0.75", 5000);
+
+// wait until connected
+connection.on("connected", async () => {
+
+    // we are now connected
+    console.log("Connected");
+
+    // find contact
+    // const contact = await connection.findContactByName("Liam's Water Tank");
+    // const contact = await connection.findContactByPublicKeyPrefix([0xc9, 0xe1, 0x50, 0x58]);
+    // const contact = await connection.findContactByPublicKeyPrefix(Buffer.from("c9e15058", "hex"));
+    const contact = await connection.findContactByPublicKeyPrefix(Buffer.from("c9e15058af33781743b222bc98105abe7429cf46f7212f767ff2a7ce1bea5dcb", "hex"));
+    if(!contact){
+        console.log("Contact not found");
+        await connection.close();
+        return;
+    }
+
+    // get sensor telemetry
+    console.log("Fetching telemetry...");
+    const telemetry = await connection.getTelemetry(contact.publicKey);
+
+    // disconnect
+    await connection.close();
+
+    // parse telemetry
+    const parsedTelemetry = CayenneLpp.parse(telemetry.lppSensorData);
+
+    // find telemetry on channel 1
+    const selfVoltageTelemetry = parsedTelemetry.find((item) => item.channel === 1 && item.type === CayenneLpp.LPP_VOLTAGE);
+
+    // make sure telemetry found
+    if(selfVoltageTelemetry == null){
+        console.log("Telemetry Missing");
+        return;
+    }
+
+    console.log({
+        voltage: selfVoltageTelemetry.value,
+    });
+
+});
+
+// connect to meshcore device
+await connection.connect();