I want to connect a UC15 3G Module to RPI 3B and use ppp protocol in order to connect RPI to internet over 3G. But the problem is that UART0 on RPI is already occupied by another device and also I can't use USB ports for this purpose. I think I should use SPI-2-UART or I2C-2-UART converters but I want to know is not there another way like multiplexing UART or like this?
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