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Added a MQTT pub/sub example of using AWS IoT (#173)

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* Added a MQTT pub/sub example of using AWS IoT (via ECC based TLS1.2 connection).

* Fixed a buffer overflow issue when receiving large MQTT packet.

* Reset TLS connection on read/write errors.
This commit is contained in:
rongsaws 2016-08-29 10:55:32 -07:00 • committed by Johan Kanflo
parent c9851e9253
commit 7041c014bb
9 changed files with 725 additions and 2 deletions
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9
extras/paho_mqtt_c/MQTTClient.c
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@ -94,8 +94,13 @@ int readPacket(MQTTClient* c, Timer* timer)
goto exit;
len = 1;
/* 2. read the remaining length. This is variable in itself */
decodePacket(c, &rem_len, left_ms(timer));
len += MQTTPacket_encode(c->readbuf + 1, rem_len); /* put the original remaining length back into the buffer */
len += decodePacket(c, &rem_len, left_ms(timer));
if (len <= 1 || len + rem_len > c->readbuf_size) /* if packet is too big to fit in our readbuf, abort */
{
rc = READ_ERROR;
goto exit;
}
MQTTPacket_encode(c->readbuf + 1, rem_len); /* put the original remaining length back into the buffer */
/* 3. read the rest of the buffer using a callback to supply the rest of the data */
if (rem_len > 0 && (c->ipstack->mqttread(c->ipstack, c->readbuf + len, rem_len, left_ms(timer)) != rem_len))
{