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There is no API to know whether UART Tx done or not.
Also PUART will be off during PDS.
So you have to write the application logic in such a way that , before doing any PUART write, it should not be in any sleep mode.
You may send a acknowledge from the peer device after receiving the PUART tx data from our side and upon receiving the ACK, put the 20719 in PDS again. Can you try some logic like that?
I will try something on the application level. Thanks.