Helper script to watch a device and connect when it becomes available.

platformio-monitor-dev.sh

#!/usr/bin/env bash

if ! hash platformio logger; then
    echo "ERROR: missing required commands" >&2
    exit 1
fi

log() {
    local level="${1:?log level required}"
    shift 1
    logger --no-act --stderr --skip-empty \
        --socket-errors=off \
        --tag "${level^^}" \
        "${@}"
}

log_period_secs=15
wait_period_secs=1
wait_for() {
    local dev="${1:?device to wait for is required}"
    local last=0
    until [[ -c "$dev"  ]]; do
        now_sec="$(date +'%s')"
        if [[ "$((now_sec - last))" -ge "$log_period_secs" ]]; then
            last="$now_sec"
            log "info" "waiting for device at $dev"
        fi
        sleep "${wait_period_secs}s"
    done
    log "info" "detected device $dev"
}

connect() {
    local dev="${1:?device to connect to is required}"
    local -a extra_flags
    shift 1
    extra_flags=("$@")
    log "info" "connecting to $dev"

    (
        set -x;
        platformio device monitor --port "$dev" "${extra_flags[@]}" || :
    )
}

connect_loop() {
    local dev="${1:?device to monitor is required}"
    local -a extra_flags
    shift 1
    extra_flags=( "$@" )

    while :; do
        wait_for "$dev"
        connect "$dev" "${extra_flags[@]}"
        log "info" "device dropped connection"
    done
}

TTY_DEV="${1:-/dev/ttyACM1}"
PIO_EXTRA_FLAGS=()

if [[ "$#" -gt 2 ]]; then
    shift 2
    # Allow '--' as a separator between device and passthru args.
    if [[ "$1" = "--" ]]; then
        shift 1
    fi
    PIO_EXTRA_FLAGS=( "$@" )
    log "debug" <<EOF
connect configured with additional args:
$(printf -- '- %q\n' "${PIO_EXTRA_FLAGS[@]}")
EOF
fi

log "info" "starting monitor loop for $TTY_DEV"

log "debug" <<EOF
Toolchain: $(platformio --version)
Revision:  $(git describe --dirty --always --long --abbrev=8 --all 2>/dev/null)
EOF

connect_loop "$TTY_DEV" "${PIO_EXTRA_FLAGS[@]}"