Reads into an existing List<int> from the socket into the range: [start,end).
Reads into an existing List<int> from the socket. If start is present, the bytes will be filled into buffer from index start, otherwise index
end is present, end - start bytes will be read into buffer, otherwise up to buffer.length. If end == start, no bytes are read. Returns the number of bytes read.int readIntoSync(List<int> buffer, [int start = 0, int end]);
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https://api.dart.dev/stable/2.5.0/dart-io/RawSynchronousSocket/readIntoSync.html