make modesbeast read nonblocking

this time for real hopefully

sdr_beast.c

@@ -137,6 +137,7 @@ bool beastOpen(void) {
     speed_t baud = B3000000;
 
     int flags = O_RDWR | O_NOCTTY;
+    //flags |= O_NONBLOCK;
     Modes.beast_fd = open(Modes.beast_serial, flags);
     if (Modes.beast_fd < 0) {
         fprintf(stderr, "Failed to open serial device %s: %s\n",
@@ -154,8 +155,9 @@ bool beastOpen(void) {
     tios.c_oflag = 0;
     tios.c_lflag = 0;
     tios.c_cflag = CS8 | CRTSCTS;
-    tios.c_cc[VMIN] = 11; // read returns when a minimum of 11 characters are available
-    tios.c_cc[VTIME] = 1; // 100 ms timeout for reads
+    //tios.c_cc[VMIN] = 11; // read returns when a minimum of 11 characters are available
+    tios.c_cc[VMIN] = 0; // polling read with vtime 0
+    tios.c_cc[VTIME] = 0;
 
     if (Modes.sdr_type == SDR_GNS) {
         baud = B921600;