https://github.com/hubmartin/mqtt_lwip_library

https://github.com/hubmartin/mqtt_lwip_library

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/hubmartin/mqtt_lwip_library
• Owner: hubmartin
• Created: 2020-02-22T17:30:19.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-02-22T17:31:17.000Z (almost 5 years ago)
• Last Synced: 2024-10-28T09:35:56.708Z (3 months ago)
• Language: C
• Size: 4.88 KB
• Stars: 3
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# MQTT LWIP libary

Some time ago I needed simple plain C MQTT library for my **TIVA LM3S6965** board (former Stellaris, former LuminaryMicro). I started rewriting library from Fan Yilun who written nice C++ library for MBed.

So I've created simple library on top of lwIP TCP stack. I've added some cleaning when you disconnect, also periodic keep-alive messages are handled "in background". You can also register your callback routine.

### mqtt.c API

```

void mqttInit(Mqtt *mqtt, struct ip_addr serverIp, int port, msgReceived fn, char *devId);

uint8_t mqttConnect(Mqtt *this);

uint8_t mqttPublish(Mqtt *this,char* pub_topic, char* msg);

uint8_t mqttDisconnect(Mqtt *this);

uint8_t mqttSubscribe(Mqtt *this, char* topic);

uint8_t mqttLive(Mqtt *this);

void mqttDisconnectForced(Mqtt *this);

```

You have to implement variable `msTimer` which counts number of milliseconds from start of the program. Also call `mqttAppHandle()` in the main loop. This function handles keep-alive packets.

Connection tested with mosquitto MQTT broker.