From 1c831ae9a48ce40a5a80ac11446cb7979b34b8ac Mon Sep 17 00:00:00 2001
From: Karl Lehenbauer <karl@flightaware.com>
Date: Wed, 27 Aug 2014 15:41:52 -0500
Subject: [PATCH] New switch allows dump1090 to work with/without dongle

* With --net-only switch dump1090 wouldn't look for an RTLSDR device

* Without --net-only switch dump1090 would abort if it couldn't find an RTLSDR
device.

* Now with --net --no-rtlsdr-ok dump1090 will try to find an RTLSDR device but
go ahead and start either way.
---
 dump1090.c | 7 +++++++
 dump1090.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/dump1090.c b/dump1090.c
index cd53413..c78a54e 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -78,6 +78,7 @@ void modesInitConfig(void) {
     Modes.net_input_beast_port    = MODES_NET_INPUT_BEAST_PORT;
     Modes.net_http_port           = MODES_NET_HTTP_PORT;
     Modes.net_fatsv_port          = MODES_NET_OUTPUT_FA_TSV_PORT;
+    Modes.no_rtlsdr_ok            = 0;
     Modes.interactive_rows        = getTermRows();
     Modes.interactive_delete_ttl  = MODES_INTERACTIVE_DELETE_TTL;
     Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
@@ -200,6 +201,9 @@ void modesInitRTLSDR(void) {
     device_count = rtlsdr_get_device_count();
     if (!device_count) {
         fprintf(stderr, "No supported RTLSDR devices found.\n");
+        if (Modes.no_rtlsdr_ok) {
+            return;
+        }
         exit(1);
     }
 
@@ -410,6 +414,7 @@ void showHelp(void) {
 "--modeac                 Enable decoding of SSR Modes 3/A & 3/C\n"
 "--net-beast              TCP raw output in Beast binary format\n"
 "--net-only               Enable just networking, no RTL device or file used\n"
+"--no-rtlsdr-ok           Keep going even if no RTLSDR device is found\n"
 "--net-fatsv-port <port>  FlightAware TSV output port (default: 10001)\n"
 "--net-http-port <port>   HTTP server port (default: 8080)\n"
 "--net-ri-port <port>     TCP raw input listen port  (default: 30001)\n"
@@ -610,6 +615,8 @@ int main(int argc, char **argv) {
         } else if (!strcmp(argv[j],"--net-only")) {
             Modes.net = 1;
             Modes.net_only = 1;
+        } else if (!strcmp(argv[j],"--no-rtlsdr-ok")) {
+            Modes.no_rtlsdr_ok = 1;
        } else if (!strcmp(argv[j],"--net-heartbeat") && more) {
             Modes.net_heartbeat_rate = atoi(argv[++j]) * 15;
        } else if (!strcmp(argv[j],"--net-ro-size") && more) {
diff --git a/dump1090.h b/dump1090.h
index af28c47..8b9d564 100644
--- a/dump1090.h
+++ b/dump1090.h
@@ -315,6 +315,7 @@ struct {                             // Internal state
     int   net_input_beast_port;      // Beast input TCP port
     int   net_http_port;             // HTTP port
     int   net_fatsv_port;            // FlightAware TSV port
+    int   no_rtlsdr_ok;              // keep going if no RTLSDR dev found
     int   net_sndbuf_size;           // TCP output buffer size (64Kb * 2^n)
     int   quiet;                     // Suppress stdout
     int   interactive;               // Interactive mode