FreeBSD shell compatible script to control WTI RPS-10 remote power switch from pfSense/OpnSense boxes

rps10_cmd.sh

#!/bin/sh

PORT=/dev/${1:-cuau0}
BAUD=${2:-9600}

# WTI RPS-10 Commands
ALL_DEVICES="*"
TOGGLE="T"
GET_STATE="?"
SWITCH_ON="1"
SWITCH_OFF="0"
DEVICE0="0"

TOGGLE_ALL_DEVICES="${ALL_DEVICES}${TOGGLE}"
TOGGLE_DEVICE0="0${TOGGLE}"
TOGGLE_DEVICE1="1${TOGGLE}"

SWITCH_ON_ALL_DEVICES="${ALL_DEVICES}${SWITCH_ON}"
SWITCH_ON_DEVICE0="0${SWITCH_ON}"
SWITCH_ON_DEVICE1="1${SWITCH_ON}"

SWITCH_OFF_ALL_DEVICES="${ALL_DEVICES}${SWITCH_OFF}"
SWITCH_OFF_DEVICE0="0${SWITCH_OFF}"
SWITCH_OFF_DEVICE1="1${SWITCH_OFF}"

GET_STATE_ALL_DEVICES="${ALL_DEVICES}${GET_STATE}"
GET_STATE_DEVICE0="0${GET_STATE}"
GET_STATE_DEVICE1="1${GET_STATE}"

Timestamp () { date "+%F %T"; }

Log () { echo "[$(Timestamp)] $1" >&2; }

Abort () { Log "$1"; exit ${2:-1}; }

ClosePort () { exec 9>&-; Log "Connection closed"; }

GetReplay () {
  local REPLY
  while true; do
    read -t ${1:-5} REPLY <&9 || return 1
    [ ${#REPLY} -eq 0 ] && continue
    [ "${REPLY}" = "Invalid" ] && return 1
    [ "${REPLY}" = "Complete" ] && sleep 0.5 && return 0
    [ "${REPLY}" = "RPS-10 Ready" ] && sleep 0.5 && return 0
    Log "$REPLY"
  done
  return 1
}

OpenPort () {
  Log "Connecting..."
  stty -f ${PORT} ${BAUD} raw -echo || return 1
  exec 9<>${PORT} || return 1
  printf "\r" >&9
  GetReplay 20 && Log "Connected to RPS-10 (${PORT}) @ ${BAUD}" && return 0
  return 1
}

SendCMD () {
  printf "\002\030\030\002\030\030$1\r" >&9
  GetReplay $2
}

OpenPort || Abort "Failed to open ${PORT}!"

SendCMD "${GET_STATE_DEVICE0}"
SendCMD "${GET_STATE_DEVICE1}"
#SendCMD "${TOGGLE_ALL_DEVICES}" 25 # Toggle commands need extra long timeout

ClosePort

exit 0