AT+WMFM=0,1,1 // OK for enabling UART1
AT+WMFM=0,1,2 // OK for enabling UART2
AT+WMFM=0,1,3 // ERROR (USB port Not able to open)
AT+WMFM=0,1,5 // ERROR (UART3 Not able to open)
I am able to open UART1, UART2 & USB CDC ACM but i am not able to open UART3.
AT+WDSO=0,5 (Trying to open UART3)
+CME ERROR: 3
Please give me some suggestions, it would be really helpful to me.