Fixed #4 by appending a single message to list.

I used the wrong option with pip install. Now it's correctly pip install --upgrade pip.

.gitignore

@@ -144,3 +144,4 @@ credentials*
 
 # emacs
 *~
+\#*\#

README.md

@@ -10,6 +10,7 @@ If you like to test this repository you are recommended to use one of the follow
  * Create a new user (e.g. "fritzab") in your _Fritz!Box_. **Don't use your default admin account!**
    * This user needs only the privileges regarding voice messages and to read from box's storage.
    * As you only need to access the _FRITZ/voicebox/rec/_ path you should remove the right to read and write everything and add only this path and only with reading privilege.
+     * __Beware!__ If you use a USB device as expanded storage for your _Fritz!Box_ and allowed the TAM to use it for storing more messages you will need another path (e.g. _Storage-01/FRITZ/voicebox/rec/_). You also have to add the FRITZ_VOICEBOX_PATH variable in your _.env_ file (see below) according to that difference.
  * You have to activate __Call Monitoring__ on your _Fritz!Box_ by using one of the connected phones and call `#96*5*`.
    * Call monitoring watches the box and the __FritzAB2Matrix__ is triggered every time a call disconnects.
    * If you cannot activate Call Monitoring the only way to use __FritzAB2MAtrix__  will be to have a cron job call it regularly. 
@@ -19,12 +20,13 @@ If you like to test this repository you are recommended to use one of the follow
    * Make it a virtual environment by `python3 -m venv <new folder>` and `source <new folder>/bin/activate`.
    * `cd <new folder>`
  * Clone the repo.
- * Inside the repo run `pip install --update pip && pip install -r requirements.txt`
+ * Inside the repo run `pip install --upgrade pip && pip install -r requirements.txt`
  * Create an `.env` file with your favourite editor:
  ```
 FRITZ_USERNAME="fritzab"
 FRITZ_PASSWORD="SomeRand0mPa55word"
 FRITZ_IP="192.168.178.1" 
+FRITZ_VOICEBOX_PATH="fritz.nas/FRITZ/voicebox"
 FRITZ_TMP="/tmp"
  ```
 __.env__

fritzab2matrix.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from fritzconnection import FritzConnection
 from dotenv import load_dotenv
@@ -26,7 +26,7 @@ if env_voicebox is None:
 if env_tmp is None:
     env_tmp = "/tmp"
 
-def main():
+def fritzab2matrix():
 
     ### CHECK AND GET MESSAGES FROM FRITZBOX ###
     ############################################
@@ -42,6 +42,7 @@ def main():
     message_list_url = message_list['NewURL']
 
 
+
     # Build the url to download the message via smb
     def build_download_url(mid, tam=0):
         recording = "rec." + str(tam) + r"." + str(mid).zfill(3)
@@ -62,12 +63,21 @@ def main():
             messages = xmltodict.parse(doc)
             return messages
 
+    l = get_message_list(message_list_url)
+    if l['Root'] == None or l['Root']['Message'] == None:
+        return False
+    else:
+        messages = l['Root']['Message']
+        if type(messages) is not list:
+            m = []
+            m.append(messages)
+            messages = m
 
-    for a in get_message_list(message_list_url)['Root']['Message']:
+    for a in messages:
         
         # format the information regarding the message
         msg_info = a['Date'] + " - " + a['Number']
-        if len(a['Name']) > 1:
+        if a['Name']:
             msg_info += " (" + a['Name'] + ") "
             
         # format the string for sound file's meta information
@@ -115,22 +125,18 @@ def main():
             continue
 
         continue
-    ### Monitor the FritzBox and trigger the main script whenever a call disconnects ###
-    ###################################################################################
-    endedCall(main, env_ip)
 
 
 
 if __name__ == "__main__":
-    try:
+
-        print("I enter the main loop ...")
+    fritzab2matrix()
-        while main():
+    ### Monitor the FritzBox and trigger the main script whenever a call disconnects ###
-            pass
+    ###################################################################################
-        else:
+    endedCall(fritzab2matrix, env_ip)
-            print("I left the main loop!")
+
         
-    except:
+
-        print("An erroneous error happened!")
 
 
 
@@ -139,5 +145,3 @@ if __name__ == "__main__":
 
 
         
-
-