Added mix as submodule

.gitmodules

@@ -174,3 +174,7 @@
 	branch = master
 	path = vendor/nph
 	url = https://github.com/arnetheduck/nph.git
+[submodule "vendor/mix"]
+	path = vendor/mix
+	url = https://github.com/vacp2p/mix.git
+	branch = mix-transport

examples/mix_lightpush_publisher.nim

@@ -0,0 +1,104 @@
+import
+  chronicles, chronos, confutils,
+  eth/[keys, p2p/discoveryv5/enr],
+  libp2p/crypto/crypto,
+  std/[tables, times, sequtils],
+  stew/byteutils,
+  stew/shims/net,
+  results,
+  waku/[
+    common/logging,
+    node/peer_manager,
+    waku_core,
+    waku_node,
+    waku_enr,
+    discovery/waku_discv5,
+    factory/builder,
+  ]
+
+proc now*(): Timestamp =
+  getNanosecondTime(getTime().toUnixFloat())
+
+# careful if running pub and sub in the same machine
+const
+  wakuPort = 60000
+  clusterId = 16
+  shardId = @[32'u16]
+  LightpushPeer =
+    "/ip4/143.198.250.233/tcp/30303/p2p/16Uiu2HAmQE7FXQc6iZHdBzYfw3qCSDa9dLc1wsBJKoP4aZvztq2d"
+
+proc setupAndPublish(rng: ref HmacDrbgContext) {.async.} =
+  # use notice to filter all waku messaging
+  setupLog(logging.LogLevel.NOTICE, logging.LogFormat.TEXT)
+
+  notice "starting publisher", wakuPort = wakuPort
+  let
+    nodeKey = crypto.PrivateKey.random(Secp256k1, rng[]).get()
+    ip = parseIpAddress("0.0.0.0")
+    flags = CapabilitiesBitfield.init(relay = true)
+
+  let relayShards = RelayShards.init(clusterId, shardId).valueOr:
+    error "Relay shards initialization failed", error = error
+    quit(QuitFailure)
+
+  var enrBuilder = EnrBuilder.init(nodeKey)
+  enrBuilder.withWakuRelaySharding(relayShards).expect(
+    "Building ENR with relay sharding failed"
+  )
+
+  let recordRes = enrBuilder.build()
+  let record =
+    if recordRes.isErr():
+      error "failed to create enr record", error = recordRes.error
+      quit(QuitFailure)
+    else:
+      recordRes.get()
+
+  var builder = WakuNodeBuilder.init()
+  builder.withNodeKey(nodeKey)
+  builder.withRecord(record)
+  builder.withNetworkConfigurationDetails(ip, Port(wakuPort)).tryGet()
+  let node = builder.build().tryGet()
+
+  node.mountMetadata(clusterId).expect("failed to mount waku metadata protocol")
+  node.mountLightPushClient()
+
+  await node.start()
+  node.peerManager.start()
+
+  # Make sure it matches the publisher. Use default value
+  # see spec: https://rfc.vac.dev/spec/23/
+  let pubSubTopic = PubsubTopic("/waku/2/rs/16/32")
+
+  # any content topic can be chosen
+  let contentTopic = ContentTopic("/examples/1/pubsub-example/proto")
+
+  notice "publisher service started"
+  while true:
+    let text = "hi there i'm a publisher"
+    let message = WakuMessage(
+      payload: toBytes(text), # content of the message
+      contentTopic: contentTopic, # content topic to publish to
+      ephemeral: true, # tell store nodes to not store it
+      timestamp: now(),
+    ) # current timestamp
+
+    let lightpushPeer = parsePeerInfo(LightpushPeer).get()
+
+    let res = await node.lightpushPublish(some(pubSubTopic), message, lightpushPeer)
+
+    if res.isOk:
+      notice "published message",
+        text = text,
+        timestamp = message.timestamp,
+        psTopic = pubSubTopic,
+        contentTopic = contentTopic
+    else:
+      error "failed to publish message", error = res.error
+
+    await sleepAsync(5000)
+
+when isMainModule:
+  let rng = crypto.newRng()
+  asyncSpawn setupAndPublish(rng)
+  runForever()

vendor/mix

@@ -0,0 +1 @@
+Subproject commit 3f9454e20e6b5d2bea5599676354a7c056799769

waku.nimble

@@ -130,6 +130,8 @@ task example2, "Build Waku examples":
   buildBinary "subscriber", "examples/"
   buildBinary "filter_subscriber", "examples/"
   buildBinary "lightpush_publisher", "examples/"
+  buildBinary "mix_filter_subscriber", "examples/"
+  buildBinary "mix_lightpush_publisher", "examples/"
 
 task chat2, "Build example Waku chat usage":
   # NOTE For debugging, set debug level. For chat usage we want minimal log