Contiki Cooja Steps to Subscribe The Message from Server in MQTT
Description: When a client publishes a message on a topic then the broker will distribute that message to any connected clients that have subscribed to that topic.
Source code
Step 1: Open a file at location:contiki/ mqtt-sn-contiki/main_core.c
// To subscribe
mqtt_sn_init(); // initiation
char *topic =”/topic_1″;
mqtt_sn_sub(topic,0); //subscribe
Step 2: Initiate the subscriber
contiki/ mqtt-sn-contiki/mqtt_sn.c
void init_sub(void *ptr)
resp_con_t mqtt_sn_sub_send(char *topic, uint8_t qos)
Subscribes the messages from broker.
Step 3: Function receives the topics.
void mqtt_sn_callback(char *topic, char *message)
{
Recived topic and message from server or broker
}
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