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haskell-plotter

Simple terminal application based on Brick, plots Pprzlink message data from Ivy bus.

ping_time

Installation

  1. you need to install GHC and Cabal
  2. run with cabal new-run haskell-plotter -- $SOME_ARGUMENTS

Usage

Haskell Ivy plotter

Usage: haskell-plotter (-m|--message MESSAGE) (-n|--name NAME) [-p|--period T]
                       [-i|--field INDEX]
  Plots data from Ivy bus in terminal. For example: haskell-plotter -m
  TELEMETRY_STATUS -n ping_time -p 1.0 -i 11

Available options:
  -m,--message MESSAGE     Pprzlink message name
  -n,--name NAME           Display name of the variable
  -p,--period T            Refresh period in seconds
  -i,--field INDEX         Index of the variable in a given message
  -h,--help                Show this help text

Example

In this example, we want to show the ping time from the TELEMETRY_STATUS message. The message on Ivy bus looks like this:

ground TELEMETRY_STATUS 1 -1 0.019837 3979054 142328 705.0 1671 2 1669 0 716 25.77'
  1. Look at Pprzlink's messages.xml and find TELEMETRY_STATUS:
    <message name="TELEMETRY_STATUS" id="32">
      <description>
        Datalink status reported by Server for the GCS
        Combines DATLINK_REPORT (telemetry class) and LINK_REPORT (ground class)
      </description>
      <field name="ac_id" type="string"/>
      <field name="link_id" type="string"/>
      <field name="time_since_last_msg" type="float" unit="s"/>
      <field name="rx_bytes" type="uint32"/>
      <field name="rx_msgs" type="uint32"/>
      <field name="rx_bytes_rate" type="float" format="%.1f" unit="bytes/s"/>
      <field name="tx_msgs" type="uint32"/>
      <field name="uplink_lost_time" type="uint32" unit="s"/>
      <field name="uplink_msgs" type="uint16"/>
      <field name="downlink_msgs" type="uint16"/>
      <field name="downlink_rate" type="uint16" unit="bytes/s"/>
      <field name="ping_time" type="float" format="%.2f" unit="ms"/>
</message>
  1. The message name is TELEMETRY_STATUS.
  2. Now we need to find the index of ping_time. Counting from top, we know that is is the 11-th field (we use 0-indexing). Hence -i 11
  3. Name of the variable is ping_time, hence -n "ping time"
  4. Optionally we can specify the update period in seconds (default is 1.0 s): -t 5
  5. Putting it all togerther we have:
$ cabal new-run haskell-plotter -- -m TELEMETRY_STATUS -n ping_time -p 5.0 -i 11
  1. And voila, here is the output: ping_time