Update main.c don't check get_payload_status if gps is on

gps_client.py

@@ -0,0 +1,68 @@
+#! /usr/bin/env python3
+"""
+example  Python gpsd client
+run this way: python3 example1.py.txt
+"""
+
+# from https://gpsd.gitlab.io/gpsd/gpsd-client-example-code.html
+
+# this client is for the CubeSatSim Lite which does not have a Pico microcontroller
+
+import gps               # the gpsd interface module
+import time
+
+try:
+
+    mode = -1    
+    lat = 0    
+    lon = 0    
+    alt = 0
+
+    session = gps.gps(mode=gps.WATCH_ENABLE)
+    
+    start = time.perf_counter()
+    
+    try:
+        while (session.read() == 0) and ((time.perf_counter() - start) < 2) and (mode < 2):
+    #        print(gps.MODE_SET)
+     #       print(session.valid)
+            if (session.valid):
+                # not useful, probably not a TPV message
+    #            continue
+    
+    #        print('Mode: %s(%d) Time: ' %
+    #              (("Invalid", "NO_FIX", "2D", "3D")[session.fix.mode],
+    #               session.fix.mode), end="")
+            # print time, if we have it
+#                print("%d " % session.fix.mode, end="")
+                if (session.fix.mode > mode):
+                    mode = session.fix.mode
+        #        if gps.TIME_SET & session.valid:
+        #            print(session.fix.time, end="")
+        #        else:
+        #            print('n/a', end="")
+            
+                if gps.isfinite(session.fix.latitude): 
+                    lat = session.fix.latitude
+                if gps.isfinite(session.fix.longitude):         
+                    lon = session.fix.longitude 
+                if gps.isfinite(session.fix.altitude):        
+                    alt = session.fix.altitude     
+#                print("%.6f %.6f %.6f" % (session.fix.latitude, session.fix.longitude, session.fix.altitude))
+               
+    #            else:
+    #                print(" 0 0 0")
+    
+    except KeyboardInterrupt:
+        # got a ^C.  Say bye, bye
+        print('')
+    
+    # Got ^C, or fell out of the loop.  Cleanup, and leave.
+    session.close()
+    print("%d %.6f %.6f %.1f" % (mode, lat, lon, alt))
+#    exit(0)
+    
+except:    
+    print("-1 0 0 0")
+    exit(0)
+

main.c

@@ -330,18 +330,46 @@ int main(int argc, char * argv[]) {
   //file5 = popen("sudo rm /home/pi/CubeSatSim/camera_out.jpg.wav > /dev/null 2>&1", "r");
   pclose(file5);
 	
+	cmdbuffer[0] = '\0';
+	gps_status = OFF;
+	FILE *gps_read = sopen("python3 /home/pi/CubeSatSim/gps_client.py");  // python sensor polling function	  
+
+	if (gps_read != NULL) {
+    	fgets(cmdbuffer, 1000, gps_read);
+    	fprintf(stderr, "gps read: %s\n", cmdbuffer);
+		if ((cmdbuffer[0] == '-') && (cmdbuffer[1] == '1'))
+		{
+			gps_status = OFF;
+			fprintf(stderr, "Pi GPS off\n");
+		} else {
+			gps_status = ON;
+			fprintf(stderr, "Pi GPS on\n");
+		}
+		fclose(gps_read);
+	} else
+		fprintf(stderr, "Error checking gps");
+	
     payload = OFF;
-    fprintf(stderr,"Opening serial\n");
-    if ((uart_fd = serialOpen("/dev/ttyAMA0", 115200)) >= 0) {  // was 9600
-      fprintf(stderr,"Serial opened to Pico\n");	    
-//      payload = ON;	
-      payload = get_payload_serial(FALSE); 
-      fprintf(stderr,"Get_payload_status: %d \n", payload);  // not debug	    
-	    
-    } else {
-      fprintf(stderr, "Unable to open UART: %s\n -> Did you configure /boot/config.txt and /boot/cmdline.txt?\n", strerror(errno));
-    }
 
+	if (gps_status == OFF)
+	{	
+	    fprintf(stderr,"Opening serial\n");
+	    if ((uart_fd = serialOpen("/dev/ttyAMA0", 115200)) >= 0) {  // was 9600
+	      fprintf(stderr,"Serial opened to Pico\n");	    
+	//      payload = ON;	
+	      payload = get_payload_serial(FALSE); 
+	      fprintf(stderr,"Get_payload_status: %d \n", payload);  // not debug	 	
+		    
+	    } else {
+	      fprintf(stderr, "Unable to open UART: %s\n -> Did you configure /boot/config.txt and /boot/cmdline.txt?\n", strerror(errno));
+	    }
+	}
+	else
+	{
+		payload = FALSE;
+		printf("get_payload_status not run since gps_status is ON\n");
+	}
+	
 	sensor_setup();
 
   if ((i2c_bus3 == OFF) || (sim_mode == TRUE)) {
@@ -649,9 +677,17 @@ int main(int argc, char * argv[]) {
 
 
   
-   
-	payload = get_payload_serial(FALSE); // not debug
-    printf("get_payload_status: %d \n", payload);
+    if (gps_status == OFF) 
+	{
+		payload = get_payload_serial(FALSE); // not debug
+		printf("get_payload_status: %d \n", payload);
+	}
+	else 
+	{
+		payload = FALSE;
+		printf("get_payload_status not run since gps_status is ON\n");
+	}
+    
 	if (payload == FALSE) {
 		payload = pi_sensors(buffer2);  
 		printf("pi_sensors status: %d \n", payload);   

main.h

@@ -66,7 +66,7 @@
 #define IHU_TEMP 2
 #define SPIN 1
 
-#define OFF - 1
+#define OFF -1
 #define ON 1
 #define CHECK 0
 #define DISABLED 0
@@ -235,6 +235,7 @@ int fail_rnd_mode = FALSE;
 int battery_saver_mode = FALSE;
 long int loopTime;
 long int failTime = 0;
+int gps_status = OFF;
 
 int error_count = 0;
 int groundCommandCount = 0;