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The BCM2073x includes two sets of APIs that are available for the application: the low-level driver API and the high-level profile API.
I know that there is a code snippet within the HW USer's Manual that shows how to initialize the peripheral UART using the low-level driver API available in the WICED SDK: WICED Smart™ Hardware Interfaces
You might also want to take a look at the code snippet here that one of our developers provided to another user: Re: Long Data from UART
This includes some other functionalit you may/may not require, but it works and shows the PUART operating at 9600, which is the lowest rate available for the PUART.
Once you have this code working, you can adjust the rate up to 19200 and see if you run into any issues.