Sniffer with ringbuf, works SOMETIMES

* Sniffer uses phone endpoints for communication and the ringbuffer
    routines the phone communication uses
* Most times the Usart1 interrupt is not triggered, and therefore
    no values are recorded

firmware/src_simtrace/ringbuffer.h

@@ -5,7 +5,7 @@
 #include <stdbool.h>
 #include <sys/types.h>
 
-#define RING_BUFLEN 64
+#define RING_BUFLEN 1024
 
 typedef struct ringbuf {
     uint8_t buf[RING_BUFLEN];