From e6c2edb6064da2574f5553919144db61d1d99550 Mon Sep 17 00:00:00 2001
From: Matthias Wirth <matthias.wirth@gmail.com>
Date: Sun, 15 Sep 2024 22:10:44 +0200
Subject: [PATCH] serial_debug

---
 net_io.c    | 8 +++++++-
 readsb.c    | 3 +++
 readsb.h    | 1 +
 sdr_beast.c | 6 +++++-
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/net_io.c b/net_io.c
index 30e4fd81..cb53b650 100644
--- a/net_io.c
+++ b/net_io.c
@@ -4439,6 +4439,10 @@ static int readClient(struct client *c, int64_t now) {
     } else {
         // read instead of recv for modesbeast / gns-hulc ....
         nread = read(c->fd, c->buf + c->buflen, left);
+        if (Modes.debug_serial) {
+            fprintTimePrecise(stderr, now);
+            fprintf(stderr, " serial read return value: %d\n", nread);
+        }
     }
     int err = errno;
 
@@ -5416,7 +5420,9 @@ void modesNetPeriodicWork(void) {
     Modes.services_in.event_progress = 0;
     Modes.services_out.event_progress = 0;
 
-    //fprintTimePrecise(stderr, now); fprintf(stderr, " event count %d wait_ms %d\n", Modes.net_event_count, (int) wait_ms);
+    if (Modes.debug_serial) {
+        fprintTimePrecise(stderr, now); fprintf(stderr, " event count %d wait_ms %d\n", Modes.net_event_count, (int) wait_ms);
+    }
 
     if (0 && Modes.net_event_count > 0) {
         fprintTimePrecise(stderr, now); fprintf(stderr, " event count %d wait_ms %d\n", Modes.net_event_count, (int) wait_ms);
diff --git a/readsb.c b/readsb.c
index 8292d919..4de6bafd 100644
--- a/readsb.c
+++ b/readsb.c
@@ -1972,6 +1972,9 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state) {
                 if (strcasecmp(token[0], "debugGPS") == 0) {
                     Modes.debug_gps = 1;
                 }
+                if (strcasecmp(token[0], "debugSerial") == 0) {
+                    Modes.debug_serial = 1;
+                }
                 if (strcasecmp(token[0], "debugZstd") == 0) {
                     Modes.debug_zstd = 1;
                 }
diff --git a/readsb.h b/readsb.h
index 06064c11..533b59f1 100644
--- a/readsb.h
+++ b/readsb.h
@@ -639,6 +639,7 @@ struct _Modes
     int8_t mode_ac; // Enable decoding of SSR Modes A & C
     int8_t mode_ac_auto; // allow toggling of A/C by Beast commands
     int8_t debug_net;
+    int8_t debug_serial;
     int8_t debug_flush;
     int8_t debug_no_discard;
     int8_t debug_nextra;
diff --git a/sdr_beast.c b/sdr_beast.c
index d3e43056..ffd0ea22 100644
--- a/sdr_beast.c
+++ b/sdr_beast.c
@@ -136,7 +136,11 @@ bool beastOpen(void) {
     struct termios tios;
     speed_t baud = B3000000;
 
-    Modes.beast_fd = open(Modes.beast_serial, O_RDWR | O_NOCTTY);
+    int flags = O_RDWR | O_NOCTTY;
+    if (Modes.debug_serial) {
+        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",
                 Modes.beast_serial, strerror(errno));