added command on and off for stored image sstv

rpitx.py

@@ -332,6 +332,7 @@ if __name__ == "__main__":
 					system("sudo rm /home/pi/CubeSatSim/camera_out.jpg > /dev/null 2>&1") 
 
 					output(pd, 1)
+					sleep(1)
 					if GPIO.input(squelch) == False:
 						print("carrier received!")
 						command_tx = not command_tx
@@ -377,6 +378,8 @@ if __name__ == "__main__":
 					file = open("/home/pi/CubeSatSim/sstv_image_1_320_x_256.jpg")
 					print("First SSTV stored image detected")
 					system("/home/pi/PiSSTVpp/pisstvpp -r 48000 -p s2 /home/pi/CubeSatSim/sstv_image_1_320_x_256.jpg") 
+					if (command_tx == True):
+
 						print ("Sending SSTV image")
 						output(txLed, txLedOn)
 						output(pd, 1)
@@ -401,6 +404,30 @@ if __name__ == "__main__":
 					print("Second SSTV stored image detected")
 					system("/home/pi/PiSSTVpp/pisstvpp -r 48000 -p s2 /home/pi/CubeSatSim/sstv_image_2_320_x_256.jpg")
 					while 1:
+
+						output(pd, 1)
+						sleep(1)
+						if GPIO.input(squelch) == False:
+							print("carrier received!")
+							command_tx = not command_tx
+							print(command_tx)
+						
+							output(green, txLedOff)
+							sleep(0.03)
+							output(green, txLedOn)
+						
+							if (command_tx == True):
+								print("Turning on transmit")
+								system("echo > command_tx True")
+#								output(txLed, txLedOn)
+#								sleep(0.5)
+#								output(txLed, txLedff)
+							else:
+								print("Turning off transmit")
+								system("echo > command_tx False")
+						output(pd, 0)			
+	
+						if (command_tx == True):
 							print ("Sending SSTV image")
 							output(txLed, txLedOn)
 							output(pd, 1)
@@ -421,8 +448,11 @@ if __name__ == "__main__":
 				except:	
 					print("image 2 did not load - copy from CubeSatSim/sstv directory")
 					if (txc == False):
+						if (command_tx == True):
 							system("(while true; do (sleep 5 && cat /home/pi/CubeSatSim/wav/sstv.wav); done) | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 434.9e3 &")
 					while 1:
+						if (command_tx == True):
+
 							output(txLed, txLedOn)
 							output(pd, 1)
 							output (ptt, 0)