diff --git a/example.py b/example.py
index 23e3dcc..c46be17 100755
--- a/example.py
+++ b/example.py
@@ -23,4 +23,4 @@
         last_device = device
 
 print("== Last 3 messages from " + last_device['name'] + ":")
-pprint(s.device_messages(last_device, limit=3))
+pprint(s.device_messages(last_device['id'], params={'limit': 3}))
diff --git a/pySigfox/pySigfox.py b/pySigfox/pySigfox.py
index 74001cb..b3b99a8 100755
--- a/pySigfox/pySigfox.py
+++ b/pySigfox/pySigfox.py
@@ -5,14 +5,16 @@
 import json
 import requests
 from pprint import pprint
+from ratelimit import limits, sleep_and_retry
+from ratelimit.exception import RateLimitException
 
 class Sigfox:
     def __init__(self, login, password, debug=False):
         if not login or not password:
             raise Exception("Please define login and password when initiating pySigfox class!")
-        self.login    = login
+        self.login = login
         self.password = password
-        self.api_url  = 'https://api.sigfox.com/v2/'
+        self.api_url = 'https://api.sigfox.com/v2/'
         self.debug = debug
 
     def login_test(self):
@@ -28,18 +30,14 @@ def device_types_list(self):
         """Return list of device types dictionaries
 
         """
-        out = []
         url = self.api_url + 'device-types'
         r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password))
-        for device in json.loads(r.text)['data']:
-            out.append(device)
-        return out
+        return r.json()['data']
 
     def device_rename(self, device_id, new_name):
         """Rename specific device
 
         """
-        out = []
         url = self.api_url + 'devices/' + str(device_id)
         if self.debug:
             print("Connecting to " + url)
@@ -49,13 +47,12 @@ def device_info(self, device_id):
         """Return information about specific device
 
         """
-        out = []
         url = self.api_url + 'devices/' + str(device_id)
         if self.debug:
             print("Connecting to " + url)
         r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password))
         try:
-            return json.loads(r.text)
+            return r.json()
         except Exception as e:
             pprint(r.text)
             raise
@@ -82,12 +79,12 @@ def device_create(self, device, cert, devicetype):
         if self.debug:
             print("Adding device " + device['id'] + " to device type " + devicetype['name'])
         to_post = {
-                    "prefix": "api_added-",
-                    "ids": [
-                             { 'id': device['id'], 'pac': device['pac'] },
-                           ],
-                    "productCertificate": str(cert), 
-                  }
+            "prefix": "api_added-",
+            "ids": [
+                {'id': device['id'], 'pac': device['pac']},
+            ],
+            "productCertificate": str(cert),
+        }
         url = self.api_url + "devicetypes/" + devicetype['id'] + '/devices/bulk/create/async'
         if self.debug:
             print("Connecting to " + url)
@@ -95,7 +92,7 @@ def device_create(self, device, cert, devicetype):
             pprint(to_post)
         r = requests.post(url,
                           auth=requests.auth.HTTPBasicAuth(self.login, self.password),
-                          json = to_post)
+                          json=to_post)
         if self.debug:
             pprint("Response: " + str(r.text))
         return r.json()
@@ -105,13 +102,13 @@ def device_types_create(self, new):
 
         """
         dtype = {
-                  'name': 'test1',
-                  'contractId': 'moire_la_30f0_30f1'
-                }
+            'name': 'test1',
+            'contractId': 'moire_la_30f0_30f1'
+        }
         url = self.api_url + 'devicetypes/create'
         if self.debug:
             print("Connecting to " + url)
-        r = requests.post(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password), data = dtype)
+        r = requests.post(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password), data=dtype)
         return r
 
     def device_list(self, device_type):
@@ -123,50 +120,68 @@ def device_list(self, device_type):
         :rtype: list
 
         """
-        device_type_ids = []
         out = []
-        url = self.api_url + 'devices?deviceTypeId=' + device_type['id']
-        r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password))
+        params = {
+            'deviceTypeId': device_type['id']
+        }
+        url = self.api_url + 'devices'
+        r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password), params=params)
         try:
-            out.extend(json.loads(r.text)['data'])
+            out += r.json()['data']
         except Exception as e:
             print("Unable to access data from returned RESP API call: " + str(e))
             pprint(r.text)
             raise
         return out
 
-    def device_messages(self, device, limit=10):
-        """Return array of 10 last messages from specific device.
-
-        :param device: Device object
-        :param limit: how many messages to retrieve - max limit 100
-        :type limit: int
+    @sleep_and_retry
+    @limits(calls=1, period=5)
+    def device_messages_page(self, url):
+        """Return array of message from paging URL.
 
         """
-
-        url = self.api_url + 'devices/' + str(device['id']) + '/messages?limit=' + str(limit)
+        out = []
         r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password))
-
+        if r.status_code == 429:
+            raise RateLimitException('Exceeded Sigfox API rate limit', 5)
         try:
-            out = json.loads(r.text)['data']
+            r_deserialized = r.json()
+            out = r_deserialized['data']
+            try:
+                out += self.device_messages_page(r_deserialized['paging']['next'])
+            except KeyError:
+                pass
         except Exception as e:
             pprint(r.text)
             raise
 
         return out
+    
+    @sleep_and_retry
+    @limits(calls=1, period=5)
+    def device_messages(self, device_id, params=None):
+        """Return array of 10 last messages from specific device.
 
-    def device_messages_page(self, url):
-        """Return array of message from paging URL.
+        :param device: Device object
+        :param limit: how many messages to retrieve - max limit 100
+        :type limit: int
 
         """
-        out = []
-        r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password))
-        out.extend(json.loads(r.text)['data'])
+        if params is None:
+            params = {'limit': 10}
+        url = self.api_url + 'devices/' + str(device_id) + '/messages'
+        r = requests.get(url, auth=requests.auth.HTTPBasicAuth(self.login, self.password), params=params)
+        if r.status_code == 429:
+            raise RateLimitException('Exceeded Sigfox API rate limit', 5)
         try:
-            json.loads(r.text)['paging']['next']
-            out.extend(self.device_messages_page(json.loads(r.text)['paging']['next']))
+            r_deserialized = r.json()
+            out = r_deserialized['data']
+            try:
+                out += self.device_messages_page(r_deserialized['paging']['next'])
+            except KeyError:
+                pass
         except Exception as e:
-            # no more pages
-            pass
+            pprint(r.text)
+            raise
 
         return out
diff --git a/setup.py b/setup.py
index 79c8303..c0b0fc9 100644
--- a/setup.py
+++ b/setup.py
@@ -12,5 +12,5 @@
                   'Programming Language :: Python :: 2.7',
                 ],
     packages=find_packages(),
-    install_requires=['requests'],
+    install_requires=['requests', 'ratelimit'],
 )