MQTT Binary Payload

[smith]

Hi,

When transmitting via TCP I've had no problems with a binary payload, however when transmitting via MQTT, I get errors when loading after ">".

Using the command:

Code: Select all

sprintf(m_buffer, "AT+CMQTTPAYLOAD=0,%u\r", length);
if(sendCommand(m_buffer, 23, 500, ">")){
	sendCommand(buffer, length, 1000, "\r\nOK\r\n");
}

Any ideas why this might be? Is there a chance I'm hitting a serial control character?

I've tested with random binary data and had sporadic successes and failures, with no clear cause.