Attempt to read entire MQTT packet #198
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Signed-off-by: Mike Gray <mike@mikegray.org>
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When MAX_MQTT_PACKET_SIZE is greater than the TCP receive buffer size, readPacket should try to read more from the ipstack. This fixes an issue I was facing with a message being 916 bytes, but the TCP receive buffer size for Mbed OS is 536 bytes. This will still exit if timer elapses or if the network data is not available.