add advanced test

Author: brentru

examples/requests_advanced_ethernet.py

@@ -16,11 +16,25 @@
 
 JSON_GET_URL = "http://httpbin.org/get"
 
+attempts = 3 # Number of attempts to retry each request
+failure_count = 0
+response = None
+
 # Define a custom header as a dict.
 headers = {"user-agent" : "blinka/1.0.0"}
 
 print("Fetching JSON data from %s..."%JSON_GET_URL)
-response = requests.get(JSON_GET_URL, headers=headers)
+while not response:
+    try:
+        response = requests.get(JSON_GET_URL, headers=headers)
+        attempts = 0
+    except AssertionError as error:
+        print("Request failed, retrying...\n", error)
+        failure_count += 1
+        if failure_count >= attempts:
+            raise AssertionError("Failed to resolve hostname, \
+                                  please check your router's DNS configuration.")
+        continue
 print('-'*60)
 
 json_data = response.json()