functionality updates

healthcheck.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Liveness check for the CoAP server. Exits 0 if healthy, 1 if not.
+#   ./healthcheck.sh          quiet, for cron/systemd/monitoring
+#   ./healthcheck.sh -v       print what it found
+# Retargets with COAP_HOST / COAP_PORT.
+
+CLIENT=${CLIENT:-$(dirname "$0")/target/release/client}
+verbose=false; [[ $1 == -v ]] && verbose=true
+say() { $verbose && echo "$@"; }
+
+host=${COAP_HOST:-127.0.0.1}; port=${COAP_PORT:-5683}
+
+[[ -x $CLIENT ]] || { echo "healthcheck: no client binary at $CLIENT (cargo build --release)"; exit 1; }
+
+reply=$("$CLIENT" get /health 2>&1)
+
+# A bound socket proves nothing on UDP - the round trip is the real test.
+if [[ $reply != "<- 2.05 "* ]]; then
+  echo "UNHEALTHY: coap://$host:$port/health -> ${reply:-no reply}"
+  exit 1
+fi
+
+body=${reply#<- 2.05 }
+if [[ $body != *'"status":"ok"'* ]]; then
+  echo "UNHEALTHY: unexpected body from coap://$host:$port/health -> $body"
+  exit 1
+fi
+
+uptime=$(sed -n 's/.*"uptime":\([0-9]*\).*/\1/p' <<<"$body")
+say "HEALTHY: coap://$host:$port up ${uptime}s (code 2.05)"
+exit 0