Put a warning header up in view1090 interactive mode when there's no connection

dump1090.h

@@ -623,6 +623,7 @@ unsigned modeCToModeA (int modeC);
 void  interactiveInit(void);
 void  interactiveShowData(void);
 void  interactiveCleanup(void);
+void  interactiveNoConnection(void);
 
 // Provided by dump1090.c / view1090.c / faup1090.c
 void receiverPositionChanged(float lat, float lon, float alt);

interactive.c

@@ -84,9 +84,6 @@ void interactiveInit() {
     initscr();
     clear();
     refresh();
-
-    mvprintw(0, 0, " Hex    Mode  Sqwk  Flight   Alt    Spd  Hdg    Lat      Long   RSSI  Msgs  Ti");
-    mvhline(1, 0, ACS_HLINE, 80);
 }
 
 void interactiveCleanup(void) {
@@ -95,6 +92,14 @@ void interactiveCleanup(void) {
     }
 }
 
+void interactiveNoConnection(void) {
+    if (!Modes.interactive)
+        return;
+
+    mvprintw(0, 0, "  /!\\ input connection lost /!\\ ");
+    refresh();
+}
+
 void interactiveShowData(void) {
     struct aircraft *a = Modes.aircrafts;
     static uint64_t next_update;
@@ -102,12 +107,18 @@ void interactiveShowData(void) {
     char progress;
     char spinner[4] = "|/-\\";
 
+    if (!Modes.interactive)
+        return;
+
     // Refresh screen every (MODES_INTERACTIVE_REFRESH_TIME) miliseconde
     if (now < next_update)
         return;
 
     next_update = now + MODES_INTERACTIVE_REFRESH_TIME;
 
+    mvprintw(0, 0, " Hex    Mode  Sqwk  Flight   Alt    Spd  Hdg    Lat      Long   RSSI  Msgs  Ti");
+    mvhline(1, 0, ACS_HLINE, 80);
+
     progress = spinner[(now/1000)%4];
     mvaddch(0, 79, progress);
 

view1090.c

@@ -100,7 +100,6 @@ void view1090Init(void) {
     modesChecksumInit(Modes.nfix_crc);
     icaoFilterInit();
     modeACInit();
-    interactiveInit();
 }
 
 //
@@ -210,23 +209,25 @@ int main(int argc, char **argv) {
     s = makeBeastInputService();
     c = serviceConnect(s, bo_connect_ipaddr, bo_connect_port);
     if (!c) {
+        interactiveCleanup();
         fprintf(stderr, "Failed to connect to %s:%d: %s\n", bo_connect_ipaddr, bo_connect_port, Modes.aneterr);
         exit(1);
     }
     sendSettings(c);
 
     // Keep going till the user does something that stops us
+    interactiveInit();
     while (!Modes.exit) {
         struct timespec r = { 0, 100 * 1000 * 1000};
         icaoFilterExpire();
         trackPeriodicUpdate();
         modesNetPeriodicWork();
 
-        if (Modes.interactive)
-            interactiveShowData();
+        interactiveShowData();
 
         if (s->connections == 0) {
             // lost input connection, try to reconnect
+            interactiveNoConnection();
             sleep(1);
             c = serviceConnect(s, bo_connect_ipaddr, bo_connect_port);
             if (c) {