basic interactions work

test-stream.sh

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+#!/usr/bin/env bash
+# End-to-end test of block-wise media streaming over CoAP/UDP. Self-contained:
+# generates test media, starts its own server, streams both files back and
+# compares them byte for byte.
+#   ./test-stream.sh          (needs: cargo build --release, ffmpeg, python3)
+# COAP_PORT picks the test server's port (default 5699).
+
+set -u
+cd "$(dirname "$0")"
+
+PORT=${COAP_PORT:-5699}
+DIR=$(mktemp -d)
+pass=0; fail=0
+server_pid=
+
+cleanup() { [[ -n $server_pid ]] && kill "$server_pid" 2>/dev/null; rm -rf "$DIR"; }
+trap cleanup EXIT
+
+ok()  { printf '  ok   %s\n' "$1"; ((pass++)); }
+bad() { printf '  FAIL %s\n' "$1"; [[ -n ${2:-} ]] && printf '%s\n' "$2" | sed 's/^/         /'; ((fail++)); }
+
+for bin in coap-hello-udp stream client; do
+  [[ -x target/release/$bin ]] || { echo "build first: cargo build --release"; exit 1; }
+done
+command -v ffmpeg >/dev/null || { echo "ffmpeg is needed to generate test media"; exit 1; }
+
+ffmpeg -hide_banner -loglevel error -f lavfi -i "sine=frequency=440:duration=10" \
+  -ac 1 -ar 16000 -c:a pcm_s16le "$DIR/audio.wav"
+ffmpeg -hide_banner -loglevel error -f lavfi -i "testsrc=size=320x240" \
+  -frames:v 1 -f rawvideo -pix_fmt rgb565le "$DIR/image.rgb565"
+
+MEDIA_DIR=$DIR COAP_PORT=$PORT target/release/coap-hello-udp >"$DIR/server.log" 2>&1 &
+server_pid=$!
+for _ in $(seq 50); do
+  ss -lun | grep -q ":$PORT " && break
+  sleep 0.1
+done
+ss -lun | grep -q ":$PORT " || { echo "server did not start:"; cat "$DIR/server.log"; exit 1; }
+
+echo "block-wise streaming tests -> udp://127.0.0.1:$PORT"
+
+check_stream() { # check_stream <audio|image> <source file>
+  local media=$1 src=$2 out="$DIR/received.$1" log
+  local size; size=$(stat -c %s "$src")
+  local blocks=$(( (size + 1023) / 1024 ))
+
+  if ! log=$(COAP_PORT=$PORT target/release/stream "$media" --no-play --out "$out" 2>&1); then
+    bad "stream $media" "$log"; return
+  fi
+  if cmp -s "$src" "$out"; then
+    ok "stream $media: $size B received byte-identical"
+  else
+    bad "stream $media: received file differs from the source"
+  fi
+  if grep -q "received $size B in $blocks blocks" <<<"$log"; then
+    ok "stream $media: $blocks blocks, $(grep -o '[0-9]* retransmits' <<<"$log")"
+  else
+    bad "stream $media: expected $size B in $blocks blocks" "$log"
+  fi
+}
+
+check_stream image "$DIR/image.rgb565"
+check_stream audio "$DIR/audio.wav"
+
+reply=$(COAP_PORT=$PORT python3 coap-inspect.py get /image --block 150 2>&1)
+if grep -q "4.02 Bad Option" <<<"$reply"; then
+  ok "block 150 of a 150-block image -> 4.02 Bad Option"
+else
+  bad "block past the end -> 4.02" "$(tail -4 <<<"$reply")"
+fi
+
+reply=$(COAP_PORT=$PORT target/release/client post /image x 2>&1)
+if [[ $reply == "<- 4.05 "* ]]; then ok "POST /image -> 4.05"; else bad "POST /image -> 4.05" "$reply"; fi
+
+if out=$(COAP_PORT=$PORT ./test-coap.sh 2>&1); then
+  ok "test-coap.sh on the same server: $(tail -1 <<<"$out")"
+else
+  bad "test-coap.sh on the same server" "$(grep FAIL <<<"$out")"
+fi
+
+echo "$pass passed, $fail failed"
+[[ $fail -eq 0 ]]