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https://github.com/joBr99/nspanel-lovelace-ui.git
synced 2025-12-19 22:24:15 +01:00
45 lines
902 B
Python
45 lines
902 B
Python
import binascii
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import struct
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import codecs
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print("Calculate NSPanel hex command from JSON payload\n")
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#value = input("Enter JSON:\n")
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value = "entityUpdHeading,Heading1234"
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def crc16(data:bytes, poly:hex=0xA001) -> str:
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'''
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CRC-16 MODBUS HASHING ALGORITHM
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'''
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crc = 0xFFFF
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for b in data:
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crc ^= b
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for _ in range(8):
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crc = ((crc >> 1) ^ poly
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if (crc & 0x0001)
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else crc >> 1)
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return crc
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payload = bytes(value, 'ascii')
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header = binascii.unhexlify('55BB')
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print("length:", len(value))
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length = len(value).to_bytes(2, 'little')
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bytes_payload = header + length + payload
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#print("bytes_payload:", bytes_payload)
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msg_crc = crc16(bytes_payload)
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#print('{:04x}'.format(msg_crc))
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crc=struct.pack('H', msg_crc)
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command=binascii.hexlify(bytes_payload + crc)
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print("\n\n")
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print(bytes.decode(command)) |