feat(waku utils): Add functions for sending messages

libs/waku_utils/waku_messages.nim

@@ -0,0 +1,25 @@
+import
+  # Nimble packages
+  chronos,
+  eth/[p2p/discoveryv5/enr],
+  httputils,
+  libp2p/crypto/crypto,
+  metrics,
+  results,
+  stew/io2, stew/byteutils,
+
+  # Nimble packages - Waku
+  waku/waku_core,
+  waku/utils/noise,
+  waku/waku_noise/noise_types,
+  waku/waku_noise/noise_handshake_processing
+
+proc prepareMessageWithHandshake*(message: string,
+                                  contentTopic: string,
+                                  hs: var HandshakeResult): Result[WakuMessage, cstring] =
+  let
+    byteMessage = toBytes(message)
+    payload = writeMessage(hs, byteMessage, hs.nametagsOutbound)
+    wakuMessage = encodePayloadV2(payload, contentTopic)
+
+  wakuMessage

src/status_node_manager/waku.nim

@@ -20,8 +20,9 @@ import
 
   # Local modules
   ../libs/waku_utils/waku_node,
-  ./rest/rest_serialization,
+  ../libs/waku_utils/waku_messages,
   ./config,
+  ./rest/rest_serialization,
   ./filepaths
 
 from confutils import OutFile, `$`
@@ -93,6 +94,26 @@ proc loadHandshakeData*(handshakeDataFile: OutFile
 
   ok(handshakeResult.get)
 
+proc wakuSendMessage*(wakuHost: ref WakuHost,
+                      message: string,
+                      contentTopic: string): Future[Result[void, string]] {.async.} =
+  let wakuMessage = prepareMessageWithHandshake(message, contentTopic,
+                                                wakuHost.wakuHandshake)
+  if wakuMessage.isErr:
+    error "Failed to prepare message", error = wakuMessage.error
+    return err("Failed to prepare message. Reason: " & $wakuMessage.error)
+
+  let res = await wakuHost.wakuNode.publish(some(wakuHost.pubsubTopic),
+                                            wakuMessage.get)
+
+  if res.isOk:
+    notice "Published message", message = message, pubSubTopic = wakuHost.pubSubTopic,
+        contentTopic = contentTopic
+    return ok()
+  else:
+    error "Failed to publish message", error = res.error
+    return err("Failed to publish message. Reason: " & res.error)
+
 proc init*(T: type WakuHost,
            rng: ref HmacDrbgContext,
            config: StatusNodeManagerConfig): Future[WakuHost] {.async.} =