very simple gps fix fake in gps driver only for development

src/drivers/gps/gps.cpp

@@ -294,6 +294,29 @@ GPS::task_main()
 			while (_Helper->receive(TIMEOUT_5HZ) > 0 && !_task_should_exit) {
 //				lock();
 				/* opportunistic publishing - else invalid data would end up on the bus */
+//#define FAKEGPS
+#ifdef FAKEGPS
+				_report.timestamp_position = hrt_absolute_time();
+				_report.lat = (int32_t)47.378301e7f;
+				_report.lon = (int32_t)8.538777e7f;
+				_report.alt = (int32_t)400e3f;
+				_report.timestamp_variance = hrt_absolute_time();
+				_report.s_variance_m_s = 10.0f;
+				_report.p_variance_m = 10.0f;
+				_report.c_variance_rad = 0.1f;
+				_report.fix_type = 3;
+				_report.eph_m = 10.0f;
+				_report.epv_m = 10.0f;
+				_report.timestamp_velocity = hrt_absolute_time();
+				_report.vel_n_m_s = 20.0f;
+				_report.vel_e_m_s = 0.0f;
+				_report.vel_d_m_s = 0.0f;
+				_report.vel_m_s = sqrtf(_report.vel_n_m_s * _report.vel_n_m_s + _report.vel_e_m_s * _report.vel_e_m_s + _report.vel_d_m_s * _report.vel_d_m_s);
+				_report.cog_rad = 0.0f;
+				_report.vel_ned_valid = true;
+
+				//no time and satellite information simulated
+#endif
 				if (_report_pub > 0) {
 					orb_publish(ORB_ID(vehicle_gps_position), _report_pub, &_report);