Attenuator API

REST API

All valid calls will reply with formatted XML. The first line will be <response status="OK"> for commands that execute correctly, or <response status="ERROR"> if either the parameters passed are invalid of the call failed for some other reason (check /var/log/syslog on the relevant Pi for more information).

REST API Call	Description
/Attenuator/set?name=<int>&value=<float>	Sets the requested attenuator to the closest possible dB value.
/Attenuator/zero_all	Set all attenuators to 0 dB.
/Attenuator/read?name=<int>	Read the current dB setting of the requested attenuator.
/Attenuator/read_all	Read the current dB setting of all attenuators.

IMPORTANT NOTE: The attenuator API will round the set request dB value to the nearest possible value based on the attenuator specs (eg. 37.63 dB with 0.5 dB/step attenuator will be rounded to 37.5 dB)

Example XML responses:

Response to: …/Attenuator/set?name=1&value=37.63

<?xml version="1.0" encoding="UTF-8"?>
<response status="OK">
  <action service="Attenuator" name="set">
    <attenuators>
      <attenuator name="1" value="37.5"/>
    </attenuators>
  </action>
</response>

Response to: …/Attenuator/zero_all

<?xml version="1.0" encoding="UTF-8"?>
<response status="OK">
  <action service="Attenuator" name="zero_all">
    <attenuators>
      <attenuator name="1" value="0.0"/>
      <attenuator name="2" value="0.0"/>
    </attenuators>
  </action>
</response>

Response to: …/Attenuator/read?name=1

<?xml version="1.0" encoding="UTF-8"?>
<response status="OK">
  <action service="Attenuator" name="read">
    <attenuators>
      <attenuator name="1" value="37.5"/>
    </attenuators>
  </action>
</response>

Response to: …/Attenuator/read_all

<?xml version="1.0" encoding="UTF-8"?>
<response status="OK">
  <action service="Attenuator" name="read_all">
    <attenuators>
      <attenuator name="1" value="37.5"/>
      <attenuator name="2" value="0.0"/>
    </attenuators>
  </action>
</response>