Send a heartbeat each minute

Author: Jbithell

README.md

@@ -26,6 +26,7 @@ If debugging on Windows you may need these drivers http://www.ftdichip.com/Drive
 | -------------------- | ----------- |
 | `LOG_LEVEL`          | `silly`     |
 | `CLOUDFLARE_API_URL` | _none_      |
+| `CLOUDFLARE_HEARTBEAT_URL` | _none_      |
 
 ### Device Configuration Variables
 

src/main.js

@@ -5,6 +5,7 @@ const responseParser = require("./parser");
 const responseValidator = require("./validator");
 const sleep = require("./sleep");
 const cloudflare = require("./targets/cloudflare");
+const cloudflareHeartbeat = require("./targets/cloudflareHeartbeat");
 
 logger.log("info", "Booted - connecting to Serial");
 /**
@@ -38,6 +39,8 @@ function serialWrite(message) {
   });
 }
 
+setInterval(cloudflareHeartbeat, 60000); // Send a heartbeat to Cloudflare every minute
+
 /**
  * Logic to query the serial device
  */

src/targets/cloudflareHeartbeat.js

@@ -0,0 +1,26 @@
+const logger = require("../logger");
+
+// Function to send a heartbeat to Cloudflare to show the device is still alive
+const cloudflareHeartbeat = () => {
+  const url = process.env.CLOUDFLARE_HEARTBEAT_URL;
+  if (!url) return;
+
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), 1500);
+
+  fetch(url, { method: "HEAD", signal: controller.signal })
+    .then((response) => {
+      if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      logger.verbose("http", "Sent heartbeat to cloudflare");
+    })
+    .catch((error) => {
+      logger.log(
+        "error",
+        "Error from cloudflare when sending heartbeat",
+        error.message
+      );
+    })
+    .finally(() => clearTimeout(timeout));
+};
+
+module.exports = cloudflareHeartbeat;