Added function to get the number of seconds since epoch

matlab/updated_scripts/transmit/get_seconds_since_epoch.m

@@ -0,0 +1,11 @@
+% Gets the number of seconds since Jan 1 1970 (epoch)
+%
+% @return seconds Number of seconds since epoch
+function [seconds] = get_seconds_since_epoch()
+    if (is_octave())
+        seconds = uint64(time());
+    else
+        seconds = uint64(convertTo(datetime('now', 'TimeZone', 'UTC'), 'epochtime'));
+    end
+end
+