I can issue at-command-sets to the WiFi module with WIZwiki-W7500’s serial.
Here is a capture of test logs. The red box is what I issued.
Connected pins between WIZwiki-W7500 and WiFi-module are only 4 pins. (3.3V, GND, UART-Tx, UART-Rx)
UART data flow is shown as below.
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Author: Steve Kim