move uart_speed to conn struct and display baudrate only for real UART

uart/uart_posix.c

@@ -60,9 +60,6 @@
 # define SOL_TCP IPPROTO_TCP
 #endif
 
-// To memorise baudrate, we don't want to call get_speed systematically
-uint32_t uart_speed;
-
 typedef struct termios term_info;
 typedef struct {
     int fd;           // Serial port file descriptor
@@ -214,8 +211,7 @@ serial_port uart_open(const char *pcPortName, uint32_t speed) {
             }
         }
     }
-    uart_speed = uart_get_speed(sp);
-    printf("[=] UART Setting serial baudrate %u\n", uart_speed);
+    conn.uart_speed = uart_get_speed(sp);
     return sp;
 }
 
@@ -422,7 +418,7 @@ bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
     cfsetospeed(&ti, stPortSpeed);
     bool result = tcsetattr(spu->fd, TCSANOW, &ti) != -1;
     if (result)
-        uart_speed = uiPortSpeed;
+        conn.uart_speed = uiPortSpeed;
     return result;
 }