diff --git a/hello_gossipsub/Makefile b/hello_gossipsub/Makefile
index eaa4647..d635bae 100644
--- a/hello_gossipsub/Makefile
+++ b/hello_gossipsub/Makefile
@@ -2,3 +2,6 @@ all: start_network
 
 start_network: src/start_network.nim
 	nim c -o:build/start_network src/start_network.nim
+
+quicksim: src/quicksim.nim
+	nim c -o:build/quicksim src/quicksim.nim
diff --git a/hello_gossipsub/src/quicksim.nim b/hello_gossipsub/src/quicksim.nim
new file mode 100644
index 0000000..734b14d
--- /dev/null
+++ b/hello_gossipsub/src/quicksim.nim
@@ -0,0 +1,78 @@
+import
+  os, strformat, chronicles, json_rpc/[rpcclient, rpcserver], nimcrypto/sysrand,
+  eth/common as eth_common, eth/keys, eth/p2p/rlpx_protocols/waku_protocol,
+  ../vendor/nimbus/nimbus/rpc/[hexstrings, rpc_types, waku],
+  options as what # TODO: Huh? Redefinition?
+
+from os import DirSep
+from strutils import rsplit
+template sourceDir: string = currentSourcePath.rsplit(DirSep, 1)[0]
+
+#const sigWakuPath = &"{sourceDir}{DirSep}rpc{DirSep}wakucallsigs.nim"
+# XXX: Hardcoded
+const sigWakuPath = &"{sourceDir}/../{DirSep}vendor/nimbus/waku/rpc/wakucallsigs.nim"
+createRpcSigs(RpcHttpClient, sigWakuPath)
+
+const topicAmount = 100
+
+let
+  trafficNode = newRpcHttpClient()
+  lightNode = newRpcHttpClient()
+  lightNode2 = newRpcHttpClient()
+
+waitFor lightNode.connect("localhost", Port(8545))
+waitFor lightNode2.connect("localhost", Port(8546))
+waitFor trafficNode.connect("localhost", Port(8548))
+
+proc generateTopics(amount = topicAmount): seq[waku_protocol.Topic] =
+  var topic: waku_protocol.Topic
+  for i in 0..<amount:
+    if randomBytes(topic) != 4:
+      raise newException(ValueError, "Generation of random topic failed.")
+    result.add(topic)
+
+let
+  symKey = "0x0000000000000000000000000000000000000000000000000000000000000001"
+  topics = generateTopics()
+  symKeyID = waitFor lightNode.waku_addSymKey(symKey)
+  options = WhisperFilterOptions(symKeyID: some(symKeyID),
+                                 topics: some(topics))
+  filterID = waitFor lightNode.waku_newMessageFilter(options)
+
+  symKeyID2 = waitFor lightNode2.waku_addSymKey(symKey)
+  options2 = WhisperFilterOptions(symKeyID: some(symKeyID2),
+                                  topics: some(topics))
+  filterID2 = waitFor lightNode2.waku_newMessageFilter(options2)
+
+  symkeyID3 = waitFor trafficNode.waku_addSymKey(symKey)
+
+var message = WhisperPostMessage(symKeyID: some(symkeyID3),
+                                ttl: 30,
+                                topic: some(topics[0]),
+                                payload: "0x45879632".HexDataStr,
+                                powTime: 1.0,
+                                powTarget: 0.002)
+
+info "Posting envelopes on all subscribed topics"
+for i in 0..<topicAmount:
+  message.topic = some(topics[i])
+  discard waitFor trafficNode.waku_post(message)
+
+# Check if the subscription for the topics works
+
+waitFor sleepAsync(1000.milliseconds) # This is a bit brittle
+
+let
+  messages = waitFor lightNode.waku_getFilterMessages(filterID)
+  messages2 = waitFor lightNode2.waku_getFilterMessages(filterID2)
+
+if messages.len != topicAmount or messages2.len != topicAmount:
+  error "Light node did not receive envelopes on all subscribed topics",
+    lightnode1=messages.len, lightnode2=messages2.len
+  quit 1
+
+info "Received envelopes on all subscribed topics"
+
+# Generate test traffic on node
+discard waitFor trafficNode.wakusim_generateRandomTraffic(10_000)
+info "Started random traffic generation"