nRF9160 Using UART with printf without all the debugging outputs from Zephyr

[JonnyMN]

How do I use printf to output my own messages, and read incoming data, from a UART port that is separate from Zephyr's debugging outputs? This UART line will be connected to another microcontroller for custom commands.

Here is what I have so far:

I want printf messages to be directed to the UART0 port for my program to talk to another device. I also want to be able to read the incoming messages.

Here is my code that works:

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while (1) {

char *s = console_getline();

printf("Here's your string: %s\n", s);

}

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while (1) {
		char *s = console_getline();
		printf("Here's your string: %s\n", s);
	}

However, with the above code, I also get what appears to be debug outputs from Zephyr being put on my UART0 line. For example, when the device starts up, I get a bunch of debug messages, etc. Also, any printk() messages are also on UART0.

I thought I could get around this by modifying the kconfig settings (via kconfig or guiconfig). I tried disabling things like the kernal boot banner, logging, etc, but the settings are reset to the defaults after rebuilding the project.