that manual is terrible - not nearly enough info to decode that protocol.
Fortunately, the python code gave me plenty of clues.
I was going to give you clues and pointers but TBF, this was a fun challenge so I did the lions share. It may not be 100% complete (or even accurate) but it should be close enough to progress...
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data available?","func":"var sma_units = {\n \"W\": 10,\n \"VA\": 10,\n \"VAr\": 10,\n \"kWh\": 3600000,\n \"kVAh\": 3600000,\n \"kVArh\": 3600000,\n \"A\": 1000,\n \"V\": 1000,\n \"°\": 1000,\n \"Hz\": 1000,\n};\nvar sma_channels = {\n //# totals\n 1: ['pconsume', 'W', 'kWh'],\n 2: ['psupply', 'W', 'kWh'],\n 3: ['qconsume', 'VAr', 'kVArh'],\n 4: ['qsupply', 'VAr', 'kVArh'],\n 9: ['sconsume', 'VA', 'kVAh'],\n 10: ['ssupply', 'VA', 'kVAh'],\n 13: ['cosphi', '°'],\n 14: ['frequency', 'Hz'],\n //# phase 1\n 21: ['p1consume', 'W', 'kWh'],\n 22: ['p1supply', 'W', 'kWh'],\n 23: ['q1consume', 'VAr', 'kVArh'],\n 24: ['q1supply', 'VAr', 'kVArh'],\n 29: ['s1consume', 'VA', 'kVAh'],\n 30: ['s1supply', 'VA', 'kVAh'],\n 31: ['i1', 'A'],\n 32: ['u1', 'V'],\n 33: ['cosphi1', '°'],\n //# phase 2\n 41: ['p2consume', 'W', 'kWh'],\n 42: ['p2supply', 'W', 'kWh'],\n 43: ['q2consume', 'VAr', 'kVArh'],\n 44: ['q2supply', 'VAr', 'kVArh'],\n 49: ['s2consume', 'VA', 'kVAh'],\n 50: ['s2supply', 'VA', 'kVAh'],\n 51: ['i2', 'A'],\n 52: ['u2', 'V'],\n 53: ['cosphi2', '°'],\n //# phase 3\n 61: ['p3consume', 'W', 'kWh'],\n 62: ['p3supply', 'W', 'kWh'],\n 63: ['q3consume', 'VAr', 'kVArh'],\n 64: ['q3supply', 'VAr', 'kVArh'],\n 69: ['s3consume', 'VA', 'kVAh'],\n 70: ['s3supply', 'VA', 'kVAh'],\n 71: ['i3', 'A'],\n 72: ['u3', 'V'],\n 73: ['cosphi3', '°'],\n //# common\n 36864: ['speedwire-version', ''],\n};\n\nmsg.result = msg.result || {};\n\nfunction decode_item_header(datatype, measurement) {\n if (datatype == 4)\n return 'actual'\n else if (datatype == 8)\n return 'counter';\n else if (datatype == 0 && measurement == 36864)\n return 'version'\n else\n return 'unknown_' + measurement;\n}\n\n// @ts-ignore\nvar pl2 = msg.payload2;\nvar pl = msg.payload;\n\nvar measurement = pl.measurement;\nvar datatype = pl.datatype;\nvar ch = sma_channels[measurement] || [];\nvar valuename = ch[0], unit = ch[1];\n\nvar hasValue = pl2.hasOwnProperty('value');\nif (valuename && hasValue) {\n var value = pl2.value;\n var typeName = decode_item_header(datatype, measurement);\n msg.result[valuename] = msg.result[valuename] || {};\n msg.result[valuename][typeName] = {};\n if (typeName == \"actual\"){\n msg.result[valuename][typeName].unit = unit;\n }\n var t = typeof value;\n if (t===\"number\") {\n msg.result[valuename][typeName].value = value / (sma_units[unit] || 1);\n } else if (t === \"bigint\") {\n msg.result[valuename][typeName].value = value / BigInt(sma_units[unit] || 1);\n } else {\n msg.result[valuename][typeName].value = value;\n }\n}\n\n\n/** @type {Buffer} */ var buf = pl2.data;\nif (buf && buf.length >= 8) {\n msg.payload = {\n data: pl2.data\n };\n return [msg,null];\n}\nmsg.payload = msg.result;\nreturn [null, 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