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Added Modbus TCP proxy #99

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Merged
githubDante merged 4 commits into from
Oct 30, 2025
Merged

Added Modbus TCP proxy #99

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c1442e9
Added Modbus TCP proxy
andrei-lazarov Oct 24, 2025
899dfc4
Use existent crc method
andrei-lazarov Oct 28, 2025
08848b7
Distinct unit and slave IDs
andrei-lazarov Oct 28, 2025
87e7680
Fix quotes
andrei-lazarov Oct 30, 2025
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7 changes: 4 additions & 3 deletions utils/solarman_tcp_proxy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,18 +46,19 @@ async def handle_client(
unit_id = await reader.readexactly(1)
pdu = await reader.readexactly(length - 1) # length includes unit_id

modbus_rtu = unit_id + pdu + get_crc(unit_id + pdu)
slave_id = b'\x01'
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modbus_rtu = slave_id + pdu + get_crc(slave_id + pdu)

try:
# Convert RTU back to TCP
reply_rtu = await solarmanv5.send_raw_modbus_frame(modbus_rtu)

unit_id_reply = reply_rtu[0:1]
slave_id_reply = reply_rtu[0:1]
pdu_reply = reply_rtu[1:-2]
crc_reply = reply_rtu[-2:]

mbap = struct.pack(">HHH", trans_id, 0, len(pdu_reply) + 1)
reply_tcp = mbap + unit_id_reply + pdu_reply
reply_tcp = mbap + unit_id + pdu_reply

writer.write(reply_tcp)
except:
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