Credit Card Numbers - Visa. These Credit card numbers validate for Visa credit cards. The number and information is as real as it can be, and contains valid bin information. The structure of the credit card number starts with a valid bin number and also validates against the LUHN's formula.
UART is a protocol (Universal asynchronous receiver/transmitter ) for serial transfer of information. You ask about an embedded system with mentioning which so I'll assume that you have a block diagram with one indicating UART.
With most projects moving to an Agile mode of testing, the software development lifecycle has become shorter, which makes it mandatory for UAT to use efficient testing processes, automation and metrics in order to deliver high quality end systems or applications that are low in cost and require minimal effort.