Subscribe using PAHO Embedded C client

[eclipse]

Subscribe using PAHO Embedded C client

[icraggs]

MQTTPacket_read() and other similar functions were originally intended to be examples, helpers that would get people started on the implementation that they needed, but wouldn't necessarily do everything. As they've become more helpful, it seems expectations have risen too.

The last parameter to MQTTPacket_read() is a callback function to read from the socket/transport layer. That callback function has as its input the number of bytes to read. It could/should wait on the socket for that number of bytes until one of the following conditions is met:

1. All the expected bytes are received. Return that byte count.
2. A timeout, if set, expires. Return the number of bytes read so far. Could be 0.
3. An error on the socket is received. Return -1

That's the basis on which I would start. The higher level clients in MQTTClient and MQTTClient-C do exactly this.

[icraggs]

I'm going to close this - I realize I look a long time to answer. Please reopen if you have further questions.