Improve Paho MQTT examples for Sync for IoT.

- Fix client tls_set call
- Fix MyFirstDocument name
- Add comments regarding trusted CA roots location
- Add example for publishing document updates

Author: Andrei Birjukov

deployed-devices/quickstarts/paho-python/publish.py

@@ -0,0 +1,34 @@
+import paho.mqtt.client as mqtt
+import json
+from datetime import datetime
+
+#
+# Use the actual location of your downloaded certificate and key.
+#
+pem_location = './CYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.pem'
+key_location = './CYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.key.decrypted'
+
+client = mqtt.Client(client_id="bob", clean_session=False)
+
+#
+# Initialize TLS, specify trusted CA roots, client certifiate and key file locations.
+# You may need to adjust the location of trusted Certificate Authorities depending on your OS.
+# Typical locations are /etc/ssl/cert.pem and /usr/local/ssl/cert.pem
+#
+client.tls_set("/usr/local/ssl/cert.pem",
+    certfile=pem_location, keyfile=key_location)
+
+#
+# Print out log messages.
+#
+def on_log(mqttc, obj, level, string):
+    print(string)
+
+client.on_log = on_log
+
+#
+# Publish current date/time to a new document, use QoS 1 to confirm delivery.
+#
+client.connect('mqtt-sync.us1.twilio.com', 8883, 60)
+client.publish('sync/docs/HelloWorld',
+    json.dumps({"hello": datetime.now().isoformat()}), qos=1)

deployed-devices/quickstarts/paho-python/subscribe-and-print.py

@@ -3,25 +3,34 @@
 #
 # Use the actual location of your downloaded certificate and key.
 #
-pem_location = '/…/CY499a5cbd774f4970a9ab51e2e8c4fb57.pem'
-key_location = '/…/CY499a5cbd774f4970a9ab51e2e8c4fb57.key.decrypted'
+pem_location = './CYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.pem'
+key_location = './CYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.key.decrypted'
 
 client = mqtt.Client(client_id="bob", clean_session=False)
-client.set_tls(None, pem_location, key_location)
 
+#
+# Initialize TLS, specify trusted CA roots, client certifiate and key file locations.
+# You may need to adjust the location of trusted Certificate Authorities depending on your OS.
+# Typical locations are /etc/ssl/cert.pem and /usr/local/ssl/cert.pem
+#
+client.tls_set("/usr/local/ssl/cert.pem",
+    certfile=pem_location, keyfile=key_location)
 
 #
-# Print out any updates.
+# Print out log messages and topic updates.
 #
-def print_message(client, userdata, msg):
-    print(msg.topic + ' ' + str(msg.payload))
+def on_log(mqttc, obj, level, string):
+    print(string)
 
+def on_message(client, userdata, msg):
+    print(msg.topic + ' ' + str(msg.payload))
 
-client.on_message = print_message
+client.on_log = on_log
+client.on_message = on_message
 
 #
 # Use qos=1 to get your device caught up right away.
 #
 client.connect('mqtt-sync.us1.twilio.com', 8883, 60)
-client.subscribe('sync/docs/MyDoc', qos=1)
+client.subscribe('sync/docs/MyFirstDocument', qos=1)
 client.loop_forever()