bool PublishToTopic(mqttMessageType &mqttMessage, const char* topic, MQTT::QoS qos)
{
MQTT::Message message;
message.qos = qos;
message.retained = false;
message.dup = false;
mqttMessage.host = "XYZ";
mqttMessage.shortMessage = "This is a short_message";
char buffer[250];
sprintf(buffer,
"{\"host\": \"%s\", "
"\"short_message\": \"%s\", "
"\"Lattitude\": \"%f\", "
"\"Longitude\": \"%f\", "
"\"Message Title\": \"%s\", "
"\"Message\": \"%s\" "
"}",
mqttMessage.host, mqttMessage.shortMessage.c_str(),
mqttMessage.lattitude, mqttMessage.longitude,
mqttMessage.messageTitle.c_str(), mqttMessage.message.c_str()
);
cout << buffer;
message.payload = (void*)buffer;
message.payloadlen = strlen(buffer) + 1;
rc = client.publish(topic, message);
if (rc != 0) {
printf("Error %d from sending QoS 0 message\n", rc);
}
else
{
cout << "Message published successfully to " << topic << endl;
}
return true;
}
int main(int argc, char* argv[])
{
IPStack ipstack = IPStack();
float version = 0.3;
const char* topic = "mbed-sample";
printf("Version is %f\n", version);
MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack);
client.setConnectionLostHandler(connect);
MQTT::Client<IPStack, Countdown>::connectionLostInfo info = {&client, &ipstack};
int rc = connect(&info);
rc = client.subscribe(topic, MQTT::QOS2, messageArrived);
if (rc != 0)
printf("rc from MQTT subscribe is %d\n", rc);
MQTT::Message message;
// QoS 0
char buf[100];
sprintf(buf, "Hello World! QoS 0 message from app version %f", version);
message.qos = MQTT::QOS0;
message.retained = false;
message.dup = false;
message.payload = (void*)buf;
message.payloadlen = strlen(buf)+1;
rc = client.publish(topic, &message);
while (arrivedcount == 0)
client.yield(100);
// QoS 1
printf("Now QoS 1\n");
sprintf(buf, "Hello World! QoS 1 message from app version %f", version);
message.qos = MQTT::QOS1;
message.payloadlen = strlen(buf)+1;
rc = client.publish(topic, &message);
while (arrivedcount == 1)
client.yield(100);
// QoS 2
sprintf(buf, "Hello World! QoS 2 message from app version %f", version);
message.qos = MQTT::QOS2;
message.payloadlen = strlen(buf)+1;
rc = client.publish(topic, &message);
while (arrivedcount == 2)
client.yield(100);
rc = client.unsubscribe(topic);
if (rc != 0)
printf("rc from unsubscribe was %d\n", rc);
rc = client.disconnect();
if (rc != 0)
printf("rc from disconnect was %d\n", rc);
ipstack.disconnect();
printf("Finishing with %d messages received\n", arrivedcount);
return 0;
}
