nr attribute

If Action/Type is "read file", this attribute specifies the number of bytes to be read.

If Action/Type is "replace", this attribute specifies the (0-based) position of the parameter in the command/response.

If Action/Type is "set", "set and get with wait", "set with wait", "open", "close", "lock", "unlock", "priority lock" or "priority unlock", this attribute specifies the (0-based) connection ID.