bestimage.py

import os
import time
import os.path
import serial


def process_image(): 

    best_file = ""
    biggest_size = 0
    imgdir = '/home/pi/to_transmit/'


    for file in os.listdir(imgdir): # for all files in "to_transmit" folder
        size = os.path.getsize(imgdir + file) # get the size of the file
        if size > biggest_size: # if the size is bigger than the previous biggest size
            biggest_size = size # reset biggest size
            best_file = file # the file is now the "best" file

  
    send_image(best_file) # initiate the sending of 'best_file'
 


def send_image(best_file): 
    print best_file
    if best_file == "":
        print "No image available."
    else:
        os.system('ssdv -e -t 50 -c PIE1 -i ibanezmatt13 /home/pi/to_transmit/' + best_file + ' packets')
        os.system('mv /home/pi/to_transmit/* /home/pi/archive')
       

        packets_file = open("packets", "rb")
        packets = packets_file.read(256)
    
        print "sending packets..."
        
       
  
        while packets != '':

            NTX2 = serial.Serial('/dev/ttyAMA0', 300, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_TWO)          
            NTX2.write(packets)
            NTX2.close()
            packets = packets_file.read(256)
            print packets

        print "PACKETS SENT!"

          
        


while True:
    process_image() # this includes processing and sending