If --hae is passed, report altitudes as HAE where available, with a H suffix.

This affects interactive mode and SBS output.

dump1090.c

@@ -709,6 +709,7 @@ void showHelp(void) {
 "--stats-every <seconds>  Show and reset stats every <seconds> seconds\n"
 "--onlyaddr               Show only ICAO addresses (testing purposes)\n"
 "--metric                 Use metric units (meters, km/h, ...)\n"
+"--hae                    Show altitudes as HAE (with H suffix) when available\n"
 "--snip <level>           Strip IQ file removing samples < level\n"
 "--debug <flags>          Debug mode (verbose), see README for details\n"
 "--quiet                  Disable output to stdout. Use for daemon applications\n"
@@ -1006,6 +1007,8 @@ int main(int argc, char **argv) {
             Modes.onlyaddr = 1;
         } else if (!strcmp(argv[j],"--metric")) {
             Modes.metric = 1;
+        } else if (!strcmp(argv[j],"--hae")) {
+            Modes.use_hae = 1;
         } else if (!strcmp(argv[j],"--aggressive")) {
             Modes.nfix_crc = MODES_MAX_BITERRORS;
         } else if (!strcmp(argv[j],"--interactive")) {

dump1090.h

@@ -323,6 +323,7 @@ struct {                             // Internal state
     int   stats_range_histo;         // Collect/show a range histogram?
     int   onlyaddr;                  // Print only ICAO addresses
     int   metric;                    // Use metric units
+    int   use_hae;                   // Use HAE altitudes with H suffix when available
     int   mlat;                      // Use Beast ascii format for raw data output, i.e. @...; iso *...;
     int   interactive_rtl1090;       // flight table in interactive mode is formatted like RTL1090
     char *json_dir;                  // Path to json base directory, or NULL not to write json.

interactive.c

@@ -118,7 +118,7 @@ void interactiveShowData(void) {
               || (((flags & (MODEAC_MSG_MODES_HIT | MODEAC_MSG_MODEC_OLD )) == 0                    ) && (msgs > 127) ) 
               ) {
                 char strSquawk[5] = " ";
-                char strFl[6]     = " ";
+                char strFl[7]     = " ";
                 char strTt[5]     = " ";
                 char strGs[5]     = " ";
 
@@ -164,12 +164,14 @@ void interactiveShowData(void) {
                     }
 
                     if (a->bFlags & MODES_ACFLAGS_AOG) {
-                        snprintf(strFl, 6," grnd");
+                        snprintf(strFl, 7," grnd");
+                    } else if (Modes.use_hae && (a->bFlags & MODES_ACFLAGS_ALTITUDE_HAE_VALID)) {
+                        snprintf(strFl, 7, "%5dH", convert_altitude(a->altitude_hae));
                     } else if (a->bFlags & MODES_ACFLAGS_ALTITUDE_VALID) {
-                        snprintf(strFl, 6, "%5d", convert_altitude(a->altitude));
+                        snprintf(strFl, 7, "%5d ", convert_altitude(a->altitude));
                     }
 
-                    printf("%s%06X %-4s  %-4s  %-8s %5s  %3s  %3s  %7s %8s %5.1f %5d %2.0f\n",
+                    printf("%s%06X %-4s  %-4s  %-8s %6s %3s  %3s  %7s %8s %5.1f %5d %2.0f\n",
                            (a->addr & MODES_NON_ICAO_ADDRESS) ? "~" : " ", (a->addr & 0xffffff),
                            strMode, strSquawk, a->flight, strFl, strGs, strTt,
                            strLat, strLon, 10 * log10(signalAverage), msgs, (now - a->seen)/1000.0);

mode_s.c

@@ -1261,15 +1261,15 @@ void useModesMessage(struct modesMessage *mm) {
     if (Modes.net) {
         if (Modes.net_verbatim || mm->msgtype == 32) {
             // Unconditionally send
-            modesQueueOutput(mm);
+            modesQueueOutput(mm, a);
         } else if (a->messages > 1) {
             // If this is the second message, and we
             // squelched the first message, then re-emit the
             // first message now.
             if (!Modes.net_verbatim && a->messages == 2) {
-                modesQueueOutput(&a->first_message);
+                modesQueueOutput(&a->first_message, a);
             }
-            modesQueueOutput(mm);
+            modesQueueOutput(mm, a);
         }
     }
 }

net_io.c

@@ -460,7 +460,7 @@ static void send_raw_heartbeat(struct net_service *service)
 // Write SBS output to TCP clients
 // The message structure mm->bFlags tells us what has been updated by this message
 //
-static void modesSendSBSOutput(struct modesMessage *mm) {
+static void modesSendSBSOutput(struct modesMessage *mm, struct aircraft *a) {
     char *p;
     struct timespec now;
     struct tm    stTime_receive, stTime_now;
@@ -535,8 +535,14 @@ static void modesSendSBSOutput(struct modesMessage *mm) {
     // Field 12 is the altitude (if we have it) - force to zero if we're on the ground
     if ((mm->bFlags & MODES_ACFLAGS_AOG_GROUND) == MODES_ACFLAGS_AOG_GROUND) {
         p += sprintf(p, ",0");
+    } else if (Modes.use_hae && (mm->bFlags & MODES_ACFLAGS_ALTITUDE_HAE_VALID)) {
+        p += sprintf(p, ",%dH", mm->altitude_hae);
     } else if (mm->bFlags & MODES_ACFLAGS_ALTITUDE_VALID) {
-        p += sprintf(p, ",%d", mm->altitude);
+        if (Modes.use_hae && (a->bFlags & MODES_ACFLAGS_HAE_DELTA_VALID)) {
+            p += sprintf(p, ",%dH", mm->altitude + a->hae_delta);
+        } else {
+            p += sprintf(p, ",%d", mm->altitude);
+        }
     } else {
         p += sprintf(p, ",");
     }
@@ -636,11 +642,11 @@ static void send_sbs_heartbeat(struct net_service *service)
 //
 //=========================================================================
 //
-void modesQueueOutput(struct modesMessage *mm) {
+void modesQueueOutput(struct modesMessage *mm, struct aircraft *a) {
     if ((mm->bFlags & MODES_ACFLAGS_FROM_MLAT) && !Modes.forward_mlat)
         return;
 
-    modesSendSBSOutput(mm);
+    modesSendSBSOutput(mm, a);
     modesSendBeastOutput(mm);
     modesSendRawOutput(mm);
 }

net_io.h

@@ -22,6 +22,7 @@
 
 // Describes a networking service (group of connections)
 
+struct aircraft;
 struct modesMessage;
 struct client;
 struct net_service;
@@ -71,7 +72,7 @@ struct net_service *makeBeastInputService(void);
 struct net_service *makeFatsvOutputService(void);
 
 void modesInitNet(void);
-void modesQueueOutput(struct modesMessage *mm);
+void modesQueueOutput(struct modesMessage *mm, struct aircraft *a);
 void modesNetPeriodicWork(void);
 
 // TODO: move these somewhere else