MQTT: Auto provide cloudmqtt cert

homeassistant/components/mqtt/__init__.py

@@ -124,6 +124,12 @@ def setup(hass, config):
     password = util.convert(conf.get(CONF_PASSWORD), str)
     certificate = util.convert(conf.get(CONF_CERTIFICATE), str)
 
+    # For cloudmqtt.com, secured connection, auto fill in certificate
+    if certificate is None and 19999 < port < 30000 and \
+       broker.endswith('.cloudmqtt.com'):
+        certificate = os.path.join(os.path.dirname(__file__),
+                                   'addtrustexternalcaroot.crt')
+
     global MQTT_CLIENT
     try:
         MQTT_CLIENT = MQTT(hass, broker, port, client_id, keepalive, username,

homeassistant/components/mqtt/addtrustexternalcaroot.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
+MIIENjCCAx6gAwIBAgIBATANBgkqhkiG9w0BAQUFADBvMQswCQYDVQQGEwJTRTEU
+MBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFs
+IFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290
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+mnkPIAou1Z5jJh5VkpTYghdae9C8x49OhgQ=
+-----END CERTIFICATE-----