Is possible use a library like "elementzonline/SIM800_MQTT" for connet to the servers of Cayenne?
the library say that need declarated
String MQTT_HOST = "test.mosquitto.org";
String MQTT_PORT = "1883";
and others
/* void connect(char *ClientIdentifier, char UserNameFlag, char PasswordFlag, char *UserName, char *Password, char CleanSession, char WillFlag, char WillQoS, char WillRetain, char *WillTopic, char *WillMessage);
ClientIdentifier :Is a string that uniquely identifies the client to the server.
:It must be unique across all clients connecting to a single server.(So it will be better for you to change that).
:It's length must be greater than 0 and less than 24
:Example "qwerty"
UserNameFlag :Indicates whether UserName is present
:Possible values (0,1)
:Default value 0 (Disabled)
PasswordFlag :Valid only when UserNameFlag is 1, otherwise its value is disregarded.
:Indicates whether Password is present
:Possible values (0,1)
:Default value 0 (Disabled)
UserName :Mandatory when UserNameFlag is 1, otherwise its value is disregarded.
:The UserName corresponding to the user who is connecting, which can be used for authentication.
Password :alid only when UserNameFlag and PasswordFlag are 1 , otherwise its value is disregarded.
:The password corresponding to the user who is connecting, which can be used for authentication.
CleanSession :If not set (0), then the server must store the subscriptions of the client after it disconnects.
:If set (1), then the server must discard any previously maintained information about the client and treat the connection as "clean".
:Possible values (0,1)
:Default value 1
WillFlag :This flag determines whether a WillMessage published on behalf of the client when client is disconnected involuntarily.
:If the WillFlag is set, the WillQoS, WillRetain, WillTopic, WilMessage fields are valid.
:Possible values (0,1)
:Default value 0 (Disables will Message)
WillQoS :Valid only when WillFlag is 1, otherwise its value is disregarded.
:Determines the QoS level of WillMessage
:Possible values (0,1,2)
:Default value 0 (QoS 0)
WillRetain :Valid only when WillFlag is 1, otherwise its value is disregarded.
:Determines whether the server should retain the Will message.
:Possible values (0,1)
:Default value 0
WillTopic :Mandatory when WillFlag is 1, otherwise its value is disregarded.
:The Will Message will published to this topic (WillTopic) in case of involuntary client disconnection.
WillMessage :Mandatory when WillFlag is 1, otherwise its value is disregarded.
:This message (WillMessage) will published to WillTopic in case of involuntary client disconnection.
*/