44 lines
1.2 KiB
Bash
Executable File
44 lines
1.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: GPL-3.0-or-later
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set -u
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KIOSK_CONFIG_FILE="${KIOSK_CONFIG_FILE:-$HOME/.config/ha-kiosk/config}"
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if [[ -r "$KIOSK_CONFIG_FILE" ]]; then
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# shellcheck source=/dev/null
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source "$KIOSK_CONFIG_FILE"
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fi
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: "${KIOSK_ID:=kiosk}"
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: "${COMMAND_ROOT:=kiosk/commands}"
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: "${STATUS_ROOT:=kiosk/status}"
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AVAILABILITY_TOPIC="${STATUS_ROOT}/${KIOSK_ID}/availability"
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PING_TOPIC="${COMMAND_ROOT}/${KIOSK_ID}/availability/ping"
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PUBLISH_INTERVAL_SECONDS="${AVAILABILITY_INTERVAL_SECONDS:-30}"
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publish_available() {
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/usr/bin/mosquitto_pub -r -t "$AVAILABILITY_TOPIC" -m "ON"
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}
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# Keep the MQTT connection that owns the Last Will open in the background.
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/usr/bin/mosquitto_sub \
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-t "$PING_TOPIC" \
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--will-topic "$AVAILABILITY_TOPIC" \
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--will-payload "OFF" \
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--will-retain &
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subscriber_pid=$!
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cleanup() {
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kill "$subscriber_pid" 2>/dev/null || true
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wait "$subscriber_pid" 2>/dev/null || true
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}
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trap cleanup EXIT INT TERM
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# Reassert retained availability after Mosquitto reconnects internally. The
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# Last Will has already published OFF when a broker connection was lost.
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while kill -0 "$subscriber_pid" 2>/dev/null; do
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publish_available || true
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sleep "$PUBLISH_INTERVAL_SECONDS"
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done
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wait "$subscriber_pid"
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