do_fhem/fhem/core/FHEM/lib/SWAP/template.xml

<?xml version="1.0"?>
<device>
  <developer>Developer_name</developer>
  <product>Product name or short description</product>
  <!-- pwrdownmode: power-down flag. If true, this device sleeps between transmissions.
  Otherwise, it continuously listens to the SWAP network -->
  <pwrdownmode>true/false</pwrdownmode>
  <!-- Configuration section -->
  <config>
    <!-- Configuration register. Register ID's start from 11 -->
    <reg name="Register name" id="reg_id">
      <!-- Configuration parameter -->
      <!-- Type of parameter: "bin": Binary, "num": Number, "str": String -->
      <param name="Parameter name" type="bin|num|str">
        <!-- position: byte.bit (format: B.b or B) position of the parameter within the register -->
        <position>B.b</position>
        <!-- size: size in bytes.bits (format: B.b or B) of the parameter within the register -->
        <size>B.b</size>
        <!-- default: default value -->
        <default>default value</default>
      </param>
    </reg>
  </config>
  <!-- Regular endpoint section. Here comes sensor readings, actuator states, etc. -->
  <regular>
    <!-- Regular register. Register ID's start from 11 -->
    <reg name="Register name" id="reg_id">
      <!-- Endpoint -->
      <!-- Type of endpoint: "bin": Binary, "num": Number, "str": String -->
      <!-- Direction: "inp": input, "out": output -->
      <endpoint name="Endpoint name" type="bin|num|str" dir="inp|out">
        <!-- position: byte.bit (format: B.b or B) position of the endpoint within the register -->
        <position>B.b</position>
        <!-- size: size in bytes.bits (format: B.b or B) of the endpoint within the register -->
        <size>B.b</size>
        <!-- units: list of units for this endpoint -->
        <units>
          <!-- unit. Value to be displayed = factor * (endpoint value) + offset name -->
          <unit name="name" factor="+-F.f" offset="+-O.o"/>
        </units>
      </endpoint>
    </reg>
  </regular>
</device>