Add exception if device can't be reached

Add ping method to test if the device is reachable

Very ugly method ...
Remove requirements

pyAlfawise/__init__.py

@@ -1,4 +1,9 @@
 from voluptuous import Schema
+import os
+
+class AlfawiseError(Exception):
+    def __init__(self, arg):
+        Exception.__init__(self, "Alfawaise device can't be reached using this ip :" + arg)
 
 
 class Alfawise:
@@ -42,6 +47,10 @@ def __init__(self, mac, ip='255.255.255.255'):
         self.property = dict.fromkeys([self.OPTION_POWER, self.OPTION_COLOR,
                                        self.OPTION_EFFECT, self.OPTION_TIMER,
                                        self.OPTION_SPEED])
+        # Test if device is available by pinging it
+        if not self._is_device_reachable(ip):
+            raise AlfawiseError(ip)
+
 
     def is_fan_on(self):
         return self.property[self.OPTION_SPEED] != self.OFF
@@ -210,4 +219,12 @@ def _send_command(self, command_type, command_name, command_value):
         command = bytes('{"command":"' + command_type + '", "' + command_name + '":"' + command_value + '","deviceid":"' + self.mac + '","modelid":"sj07","phoneid":"020000000000","userid":""}',
                         'UTF-8')
         sock.sendto(command, (self.ip, 10002))
-        sock.close()
+        sock.close()
+
+    def _is_device_reachable(self, hostname):
+        response = os.system("ping -c 1 " + hostname)
+        # and then check the response...
+        if response == 0:
+            return True
+        else:
+            return False

setup.py

@@ -4,12 +4,12 @@
     name='pyAlfawise',
     packages=['pyAlfawise'],  # this must be the same as the name above
     install_requires=['voluptuous'],
-    version='0.4-beta',
+    version='0.5-beta',
     description='a simple python3 library for the Alfawise Humidifier',
     author='Hydreliox',
     author_email='[email protected]',
     url='https://github.com/HydrelioxGitHub/pyAlfawise',  # use the URL to the github repo
-    download_url='https://github.com/HydrelioxGitHub/pyAlfawise/tarball/0.1-beta',
+    download_url='https://github.com/HydrelioxGitHub/pyAlfawise/tarball/0.5-beta',
     keywords=['alfawise', 'humidifier', 'mist', 'API'],  # arbitrary keywords
     classifiers=[],
 )