Describe the remaining protocol.

README.md

    * Salt: The first 7 bytes of the payload hold the salt used by the sensor node
      from this time on.
    * Report: The payload consists of a number of (value type, value)-tuples. The
-     possible value types and the corresponding value suze are listed below.
+     possible value types and the corresponding value size are listed below.
+   * GetValues: The payload consists of a list of value types. It is the sender's
+     responsibility to ensure that the resulting response fits into one packet.
+     If too many values are requested, the base station will ignore the request.
+   * Values: The payload consists of a list of (value type, report time, value)
+     tuples. The report time is the unix time of the last report of the
+     corresponding sensor node.
 
 5. CRC-16-CCITT checksum