MQTT support streaming large payload

Hi,

nRF9160 examples in NCS, the MQTT publish payload now with a pre allocated buffer,  is it possible to support streaming payload to save memory usage for large payload publish.

Q1: does current NCS release (modem firmware 1.2.3, or 1.3.0) support publish >20KBytes payload in 1 single message?

Q2: is it possible to publish >20K bytes with data streaming to socket instead with pre allocated buffer in RAM?

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