This code is fault tolerant

ch-13/2-fusing-sensors/no_imu/graphing.html

@@ -8,8 +8,11 @@
 
   var current_dataset = [];
   while (true) {
+    try {
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), 1000);
       // fetch new data
-    await d3.json("/data").then(function(data) {
+      await d3.json("/data", {signal: controller.signal}).then(function(data) {
         // then append to list
         current_dataset.push(data);
         // Map to a 10s (n S) sliding window
@@ -31,6 +34,10 @@
         var graphNode = document.getElementById("value");
         graphNode.replaceChild(value_graph, graphNode.firstChild);      
       });
+      clearTimeout(timeoutId);
+    } catch (error) {
+      console.log(error.name === 'AbortError');
+    }
   }
   // }
 </script>

ch-13/2-fusing-sensors/no_imu/no_sensors.py

@@ -1,5 +1,6 @@
 import time
 import json
+import traceback
 
 from adafruit_esp32spi import adafruit_esp32spi_wsgiserver
 from adafruit_wsgi.wsgi_app import WSGIApp
@@ -16,8 +17,10 @@ class RandomWalkSensors:
 
         self.start_time = time.monotonic()
         self.last_time = self.start_time
+        # self.app = None
 
     def setup_wifi(self, app):
+        # self.app = app
         print("Setting up wifi.")
         self.wifi, esp = robot_wifi.connect_to_wifi()
         self.server = adafruit_esp32spi_wsgiserver.WSGIServer(80, application=app)
@@ -28,6 +31,10 @@ class RandomWalkSensors:
         ip_int = ".".join(str(int(n)) for n in esp.ip_address)
         print(f"IP Address is {ip_int}")
 
+    def reconnect(self):
+        self.wifi.connect()
+        self.server.start()
+
     def data(self, request):
 
         return (
@@ -66,9 +73,9 @@ class RandomWalkSensors:
                 self.update()
                 self.server.update_poll()
             except RuntimeError as e:
-                print(f"Server poll error: {type(e)}, {e}")
-                print(f"Resetting ESP...")
+                traceback.print_exception(BaseException, e, e.__traceback__)
                 self.wifi.reset()
+                self.reconnect()
                 print("Reset complete.")
 
     def start(self):