dzialajaca konfiguracja

upload_config.py

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+#!/usr/bin/env python3
+
+import binascii
+import sys
+import math
+import json
+import tftpy
+import time
+
+
+if len(sys.argv) < 2:
+    print("usage: upload.py <config.txt>")
+    exit(-1)
+
+
+# Check for a valid JSON formatted file, if ok upload to NVEM board via TFTP
+with open(sys.argv[1], 'r') as jsonFile:
+    try:
+        testForValidJson = json.load(jsonFile)
+        print('Valid JSON config file, uploading to NVEM board')
+                
+    except ValueError:
+        print('Incorrectly formatted JSON configuration file')
+        exit(-1)
+
+
+# Load File
+config = open(sys.argv[1], "rb").read()
+
+# Compute length (in bytes and words)
+jsonLength = len(config)
+length = math.ceil(jsonLength / 4)
+mod = jsonLength % 4
+print('Config file length (words) =', length)
+print('Config file length (bytes) =', jsonLength)
+print('Remainder =', mod)
+
+# add padding at end of file to ensure length is multiple of 4 bytes (word)
+# to ensure correct CRC32 calculation
+if mod > 0:
+    padding = [0 for i in range(4 - mod)]
+    print('Padding added = ', padding)
+    config = config + bytes(padding)
+
+newLength = len(config)
+print('Config file length with padding (bytes) =', newLength)
+
+# Compute crc32
+crc32 = binascii.crc32(config)
+print('CRC-32 =',hex(crc32))
+
+# Insert metadata
+metadata = [0 for i in range(512)]
+metadata[0] = crc32 & 0xff
+metadata[1] = (crc32 >> 8) & 0xff
+metadata[2] = (crc32 >> 16) & 0xff
+metadata[3] = (crc32 >> 24) & 0xff
+metadata[4] = length & 0xff
+metadata[5] = (length >> 8) & 0xff
+metadata[6] = (length >> 16) & 0xff
+metadata[7] = (length >> 24) & 0xff
+metadata[8] = jsonLength & 0xff
+metadata[9] = (jsonLength >> 8) & 0xff
+metadata[10] = (jsonLength >> 16) & 0xff
+metadata[11] = (jsonLength >> 24) & 0xff
+config = bytes(metadata) + config
+
+open("/tmp/config.txt", "wb").write(config)
+
+# Upload using TFTP, set large timeout
+client = tftpy.TftpClient("10.10.10.10", 69)
+client.upload("config", "/tmp/config.txt", timeout=30)