read abstract method

List<int> read([int len ])

Read up to len bytes from the socket. This function is non-blocking and will only return data if data is available. The number of bytes read can be less then len if fewer bytes are available for immediate reading. If no data is available null is returned.

Source

List<int> read([int len]);

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https://api.dartlang.org/stable/1.24.3/dart-io/RawSocket/read.html