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Re: [paho-dev] Publish does not appear in Broker
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Hi Mike,
I’m not an expert with the C/C++ lib and the APIs, but it seems
you’re trying to use MQTT-SN instead of plain MQTT. At least HiveMQ
does currently not support MQTT-SN.
Could this be the source of the problem?
Best,
Dominik
On 19 Jul 2018, at 13:07, Mike Maikaefer wrote:
Hi,
I'm using the embedded C/C++ variant of the PAHO-project out of a
microcontroller. My Problem: although the data are sent (can be
verified
with WireShark), a broker these data sent to does not recognise them
and
does not show the related data. This was testedwith HiveMQ and
BevyWise
MQTTRoute.
This is what I'm doing to create and send a message (pseudo-code due
to
some microcontroller-specific function calls):
MQTTSNPacket_connectData data=MQTTSNPacket_connectData_initializer;
int rc=0,payloadlen,len;
unsigned char buf[MAX_BUFLEN+1];
MQTTSN_topicid topic;
char payload[200+1];
char id[200+1];
--> open a TCP/IP conection to the broker here
data.clientID.cstring=(char*)m_machineID->c_str(); // get
identifier
from std::string
data.cleansession=1;
len = MQTTSNSerialize_connect(buf,MAX_BUFLEN,&data);
topic.data.long_.name=(char*)topicData->c_str(); // get the topic
data
topic.data.long_.len=strlen(topic.data.long_.name);
strncpy(payload,payData->c_str(),200); // get the data to be sent
payloadlen=strlen(payload);
len+=MQTTSNSerialize_publish(buf+len,MAX_BUFLEN-len,0,3,0,0,topic,(unsigned
char*)payload,payloadlen);
// here the fourth parameter has to be "3", when setting it to "0",
the
topic does not become part
// of the data in "buf"
len+=MQTTSNSerialize_disconnect(buf+len,MAX_BUFLEN-len,200);
--> send the data in "buf" with the length "len" here - this is
successful
--> close the TCP/IP connection to the broker here
Any idea what I'm doing wrong here?
Thanks!
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