The sprintf call as you have it assumes that the payload is
null-terminated. This is the message arrived callback from the
paho_c_sub.c sample:
int messageArrived(void *context, char *topicName, int
topicLen, MQTTAsync_message *message)
{
if (opts.showtopics)
printf("%s\t", topicName);
if (opts.nodelimiter)
printf("%.*s", message->payloadlen,
(char*)message->payload);
else
printf("%.*s%c", message->payloadlen,
(char*)message->payload, opts.delimiter);
fflush(stdout);
MQTTAsync_freeMessage(&message);
MQTTAsync_free(topicName);
return 1;
}
Ian
On 14/12/2017 13:28, Vamsinag Gunti
wrote:
Hello Ian,
I am printing it to the console using puts() function.
char*
payloadptr;
payloadptr = (char*)malloc(message->payloadlen);
sprintf(payloadptr, "%s", ((char*)message->payload));
puts(payloadptr);
How are you displaying the content
of the payload? (In code terms)
Ian
--
Best Regards,
Vamsinag Gunti
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--
Ian Craggs
icraggs@xxxxxxxxxx IBM United Kingdom
Paho Project Lead; Committer on Mosquitto
