#!/usr/bin/env bash
# Hold a single TCP session open and drip stop-monitoring frames at a slow
# rate, so the device's UART RX FIFO has time to drain between sends.
#
# Use when high-rate spam isn't landing — typically because the device's
# firmware is too busy to drain its serial buffer fast enough and bytes
# are being lost to UART overrun.
#
# Usage:
#   ./slow_drip.sh <host> [tcp_port] [duration_s]
#
# Env:
#   DURATION         Default: 120 (seconds; arg 3 overrides). Clamped 1..600.
#   INTERVAL         Seconds between drip sends (default 3).  Lower = more
#                    aggressive, more risk of FIFO overrun.  Higher = safer
#                    but fewer total drips per duration.
#   CONNECT_TIMEOUT  Default: 5
#   SFM_BASE_URL     Default: http://localhost:8200 (SFM direct).

set -u

host="${1:-}"
tcp_port="${2:-9034}"
duration="${3:-${DURATION:-120}}"
if [[ -z "$host" ]]; then
  echo "usage: $0 <host> [tcp_port] [duration_s]" >&2
  exit 2
fi

base="${SFM_BASE_URL:-http://localhost:8200}"
interval="${INTERVAL:-3}"
connect_timeout="${CONNECT_TIMEOUT:-5}"

url="${base}/device/stop_monitoring_slow_drip?host=${host}&tcp_port=${tcp_port}&duration_s=${duration}&interval_s=${interval}&connect_timeout=${connect_timeout}"

echo "slow_drip: target ${host}:${tcp_port}  duration=${duration}s  interval=${interval}s  connect_timeout=${connect_timeout}s"
echo "slow_drip: POST ${url}"
echo

# Give curl enough slack to wait out the duration plus a buffer
max_time=$(awk -v d="$duration" 'BEGIN { printf "%d", d + 30 }')

curl -sS --max-time "$max_time" -X POST "$url"
echo