enable mix in enr and add mix protocol config

waku/factory/external_config.nim

@@ -665,8 +665,15 @@ with the drawback of consuming some more bandwidth.""",
     .}: bool
 
     #Mix config
-    mixkey* {.desc: "ED25519 private key as 64 char hex string.", name: "mixkey".}:
-      Option[string]
+    mix* {.
+      desc: "Enable mix protocol: true|false",
+      defaultValue: false,
+      name: "mix"
+    .}: bool
+    mixkey* {.
+      desc: "ED25519 private key as 64 char hex string.",
+      name: "mixkey"
+    .}: Option[string]
     #TODO: Temp config for simulations.Ideally need to get this info from bootstrap ENRs
 #[     mixBootstrapNodes* {. 
       desc:

waku/factory/internal_config.nim

@@ -122,6 +122,7 @@ proc networkConfiguration*(conf: WakuNodeConf, clientId: string): NetConfigResul
       store = conf.store,
       relay = conf.relay,
       sync = conf.storeSync,
+      mix = conf.mix,
     )
 
   # Resolve and use DNS domain IP

waku/factory/node_factory.nim

@@ -427,16 +427,17 @@ proc setupProtocols(
         err("failed to set node waku peer-exchange peer: " & peerExchangeNode.error)
 
   #mount mix
-  let mixPrivKey:string =
-    if conf.mixkey.isSome():
-      conf.mixkey.get()
-    else:
-      error "missing mix key"
-      return err("missing mix key")
-  (
-    await node.mountMix(mixPrivKey)
-  ).isOkOr:
-    return err("failed to mount waku mix protocol: " & $error)
+  if conf.mix:
+    let mixPrivKey:string =
+      if conf.mixkey.isSome():
+        conf.mixkey.get()
+      else:
+        error "missing mix key"
+        return err("missing mix key")
+    (
+      await node.mountMix(mixPrivKey)
+    ).isOkOr:
+      return err("failed to mount waku mix protocol: " & $error)
   return ok()
 
 ## Start node

waku/waku_enr/capabilities.nim

@@ -20,6 +20,7 @@ type
     Filter = 2
     Lightpush = 3
     Sync = 4
+    Mix = 5
 
 const capabilityToCodec = {
   Capabilities.Relay: WakuRelayCodec,
@@ -30,7 +31,7 @@ const capabilityToCodec = {
 }.toTable
 
 func init*(
-    T: type CapabilitiesBitfield, lightpush, filter, store, relay, sync: bool = false
+    T: type CapabilitiesBitfield, lightpush, filter, store, relay, sync, mix: bool = false
 ): T =
   ## Creates an waku2 ENR flag bit field according to RFC 31 (https://rfc.vac.dev/spec/31/)
   var bitfield: uint8
@@ -44,6 +45,8 @@ func init*(
     bitfield.setBit(3)
   if sync:
     bitfield.setBit(4)
+  if mix:
+    bitfield.setBit(5)
   CapabilitiesBitfield(bitfield)
 
 func init*(T: type CapabilitiesBitfield, caps: varargs[Capabilities]): T =

waku/waku_lightpush/client.nim

@@ -127,4 +127,6 @@ proc publishWithConn*(
   for obs in wl.publishObservers:
     obs.onMessagePublished(pubSubTopic, message)
 
-    return lightpushSuccessResult(1)
+  #TODO: Implement response handling.
+  
+  return lightpushSuccessResult(1)