fix: Improve mapeo core start-up after reload during development

When the app is reloaded in dev, the node server does not reload.
This requests the server status when the RN app starts, in case it is
already running. Also reduces the interval between heartbeats from the server

src/backend/status.js

@@ -5,12 +5,16 @@ const constants = require("./constants");
 class ServerStatus {
   constructor() {
     this.setState(constants.STARTING);
+    rnBridge.channel.on("request-status", () => {
+      log("status request");
+      rnBridge.channel.post("status", this.state);
+    });
   }
   startHeartbeat() {
     if (this.intervalId) return; // Don't have two heartbeats
     this.intervalId = setInterval(() => {
       rnBridge.channel.post("status", this.state);
-    }, 1000);
+    }, 4000);
   }
   pauseHeartbeat() {
     clearInterval(this.intervalId);

src/frontend/api.js

@@ -147,6 +147,8 @@ export function Api({
     // Start server, returns a promise that resolves when the server is ready
     // or rejects if there is an error starting the server
     startServer: function startServer(): Promise<void> {
+      // The server might already be started - request current status
+      nodejs.channel.post("request-status");
       // The server requires read & write permissions for external storage
       const serverStartPromise = PermissionsAndroid.requestMultiple([
         PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE,