Adding python tool for extending a binary firmware file with the length and checksum as the start as required for OTA update

Author: aentinger

extras/tools/bin2ota.py

@@ -0,0 +1,27 @@
+#!/usr/bin/python3
+
+import sys
+import crccheck
+
+if len(sys.argv) != 3:
+    print ("Usage: bin2ota.py sketch.bin sketch-ota.bin")
+    sys.exit()
+
+ifile = sys.argv[1]
+ofile = sys.argv[2]
+
+# Read the binary file
+in_file = open(ifile, "rb")
+bin_data = bytearray(in_file.read())
+in_file.close()
+
+# Calculate length and CRC32
+bin_data_len = len(bin_data)
+bin_data_crc = crccheck.crc.Crc32.calc(bin_data)
+
+# Write to outfile
+out_file = open(ofile, "wb")
+out_file.write((bin_data_len).to_bytes(4,byteorder='little'))
+out_file.write((bin_data_crc).to_bytes(4,byteorder='little'))
+out_file.write(bin_data)
+out_file.close()