sdlog2: Complete conversion to on-demand subscriptions

src/modules/sdlog2/sdlog2.c

@@ -163,8 +163,6 @@ static const int LOG_BUFFER_SIZE_DEFAULT = 8192;
 static const int MAX_WRITE_CHUNK = 512;
 static const int MIN_BYTES_TO_WRITE = 512;
 
-static const unsigned TELEMETRY_STATUS_MAX_LOG = 2;// TELEMETRY_STATUS_ORB_ID_NUM
-
 static bool _extended_logging = false;
 
 #define MOUNTPOINT "/fs/microsd"
@@ -1164,15 +1162,11 @@ int sdlog2_thread_main(int argc, char *argv[])
 	/* add new topics HERE */
 
 
-	for (unsigned i = 0; i < TELEMETRY_STATUS_MAX_LOG; i++) {
-		subs.telemetry_subs[i] = orb_subscribe(telemetry_status_orb_id[i]);
-	}
-
-	if (_extended_logging) {
-		subs.sat_info_sub = orb_subscribe(ORB_ID(satellite_info));
-	} else {
-		subs.sat_info_sub = 0;
+	for (unsigned i = 0; i < TELEMETRY_STATUS_ORB_ID_NUM; i++) {
+		subs.telemetry_subs[i] = -1;
 	}
+
+	subs.sat_info_sub = -1;
 
 	/* close non-needed fd's */
 
@@ -1752,7 +1746,7 @@ int sdlog2_thread_main(int argc, char *argv[])
 		}
 
 		/* --- TELEMETRY --- */
-		for (unsigned i = 0; i < TELEMETRY_STATUS_MAX_LOG; i++) {
+		for (unsigned i = 0; i < TELEMETRY_STATUS_ORB_ID_NUM; i++) {
 			if (copy_if_updated(telemetry_status_orb_id[i], subs.telemetry_subs[i], &buf.telemetry)) {
 				log_msg.msg_type = LOG_TEL0_MSG + i;
 				log_msg.body.log_TEL.rssi = buf.telemetry.rssi;