C++ implementation for Arduino devices of the MQTT-SN protocol 1.2 (https://mqtt.org/mqtt-specification/ or https://groups.oasis-open.org/higherlogic/ws/public/document?document_id=66091).
The library was tested with EMQX (https://www.emqx.com/en) and Hive MQ Edge (https://www.hivemq.com/products/hivemq-edge/).
Start from this url http://www.steves-internet-guide.com/mqtt-sn/ for understanding more about the protocol MQTT-SN.
The whole project is available on https://github.com/marcoratto/mqttsn12-arduino-client
Below you can find the list of the Message Type implemented:
| MsgType | Field | Status | Note |
|---|---|---|---|
| 0x00 | ADVERTISE | NA | |
| 0x01 | SEARCHGW | Implemented | |
| 0x02 | GWINFO | Implemented | |
| 0x03 | reserved | NA | |
| 0x04 | CONNECT | Implemented | |
| 0x05 | CONNACK | Implemented | |
| 0x06 | WILLTOPICREQ | Implemented | |
| 0x07 | WILLTOPIC | Implemented | |
| 0x08 | WILLMSGREQ | Implemented | |
| 0x09 | WILLMSG | Implemented | |
| 0x0A | REGISTER | Implemented | |
| 0x0B | REGACK | Implemented | |
| 0x0C | PUBLISH | Implemented | |
| 0x0D | PUBACK | Implemented | |
| 0x0E | PUBCOMP | NA | |
| 0x0F | PUBREC | NA | |
| 0x10 | PUBREL | NA | |
| 0x11 | reserved | NA | |
| 0x12 | SUBSCRIBE | Implemented | |
| 0x13 | SUBACK | Implemented | |
| 0x14 | UNSUBSCRIBE | Implemented | |
| 0x15 | UNSUBACK | Implemented | |
| 0x16 | PINGREQ | Implemented | |
| 0x17 | PINGRESP | Implemented | |
| 0x18 | DISCONNECT | Implemented | |
| 0x19 | reserved | NA | |
| 0x1A | WILLTOPICUPD | Implemented | |
| 0x1B | WILLTOPICRESP | Implemented | |
| 0x1C | WILLMSGUPD | Implemented | |
| 0x1D | WILLMSGRESP | Implemented | |
| 0x1E-0xFD | reserved | NA | |
| 0xFE | Encapsulated message | NA | |
| 0xFF | reserved | NA |