elementzonline / Sim800_mqtt
Licence: gpl-3.0
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SIM800_MQTT
#AutoConnect CallBack function
- Use this function if you want to use autoconnect(and auto reconnect) facility
- This function is called whenever TCP connection is established (or re-established).
#connect function
- This function can be used to connect your client to MQTT broker.
- Use only if you do not use Auto connect functionality.
- Optionally you can use username, password, WILL topic and WILL Message.
#OnConnect CallBack function
- This call back function is called when MQTT connection is established.
- You can call subscription and publish functions inside it (according to your need).
Publish function
- This function can be used to publish messages to different topics.
- You can select QoS levels and RETAIN flag according to your need.
Subscribe function
- This function can be used to subscribe messages from different topics.
OnMessage CallBack function
- This callback function is called when messages are received from subscribed topics
- Topic, TopicLength, Message, MessageLength are the arguments of OnMessage callback function.
- Inside this, you can write your custom code.
#unsubscribe function
- This function can be used to unsubscribe from a previously subscribed topic.
#disconnect function
- This function can be used to disconnect your client from MQTT broker.
#available function
- return true when connection with mqtt brocker is existing
Other Features :
- You can specify your KeepAlive duration while initializing.
- Ping requests are sent and received automatically.
- QoS 0,1,2
Note:
Use the examples as a template.
To Do:
- [ ] Move the functions Autoconnect, OnConnect and OnMessage to the source code
- [ ] Implement a generic way to include external functions and their parameters to the funtions AutoConnect and OnConnect
- [ ] Change the function OnMessage to be a callback
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