diff --git a/apps/chat2mix/chat2mix.nim b/apps/chat2mix/chat2mix.nim
index 3eee046f3..f5306941a 100644
--- a/apps/chat2mix/chat2mix.nim
+++ b/apps/chat2mix/chat2mix.nim
@@ -425,6 +425,12 @@ proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
 
   var enrBuilder = EnrBuilder.init(nodeKey)
 
+  enrBuilder.withWakuRelaySharding(
+    RelayShards(clusterId: conf.clusterId, shardIds: conf.shards)
+  ).isOkOr:
+    error "failed to add sharded topics to ENR", error = error
+    quit(QuitFailure)
+
   let recordRes = enrBuilder.build()
   let record =
     if recordRes.isErr():
@@ -451,11 +457,15 @@ proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
     .tryGet()
     builder.build().tryGet()
 
-  await node.start()
-  #TODO: fix hard-coding.
-  node.mountSharding(conf.clusterId, 1).isOkOr:
+  node.mountSharding(conf.clusterId, conf.numShardsInNetwork).isOkOr:
     error "failed to mount waku sharding: ", error = error
     quit(QuitFailure)
+  node.mountMetadata(conf.clusterId).isOkOr:
+    error "failed to mount waku metadata protocol: ", err = error
+    quit 1
+
+  await node.start()
+
   #[   if conf.rlnRelayCredPath == "":
     raise newException(ConfigurationError, "rln-relay-cred-path MUST be passed")
 
diff --git a/apps/chat2mix/config_chat2mix.nim b/apps/chat2mix/config_chat2mix.nim
index 21ee5a641..221cafc3b 100644
--- a/apps/chat2mix/config_chat2mix.nim
+++ b/apps/chat2mix/config_chat2mix.nim
@@ -91,10 +91,16 @@ type
     clusterId* {.
       desc:
         "Cluster id that the node is running in. Node in a different cluster id is disconnected.",
-      defaultValue: 42,
+      defaultValue: 2,
       name: "cluster-id"
     .}: uint16
 
+    numShardsInNetwork* {.
+      desc: "Number of shards in the network",
+      defaultValue: 1,
+      name: "num-shards-in-network"
+    .}: uint32
+
     shards* {.
       desc:
         "Shards index to subscribe to [0..NUM_SHARDS_IN_NETWORK-1]. Argument may be repeated.",