added APRS rpitx based on file ready

rpitx.py

@@ -48,7 +48,13 @@ if __name__ == "__main__":
         if (('a' == sys.argv[1]) or ('afsk' in sys.argv[1])):
             print("AFSK") 
 	    while True:
-    		time.sleep(5)
+		try:
+			f = open("ready")
+			os.system("gen_packets -o telem.wav t.txt -r 48000 > /dev/null 2>&1 && cat telem.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f 434.9e3 > /dev/null 2>&1")
+			os.system("rm ready")
+			time.sleep(0.5)
+		except:		  
+    			time.sleep(0.5)
         elif (('s' == sys.argv[1]) or ('sstv' in sys.argv[1])):
             print("SSTV")
 	    GPIO.output(txLed, txLedOn);