diff --git a/beacon_node/client/src/notifier.rs b/beacon_node/client/src/notifier.rs
index 987f064a4a..ff6c1b230c 100644
--- a/beacon_node/client/src/notifier.rs
+++ b/beacon_node/client/src/notifier.rs
@@ -8,7 +8,7 @@ use tokio::runtime::TaskExecutor;
 use tokio::timer::Interval;
 
 /// The interval between heartbeat events.
-pub const HEARTBEAT_INTERVAL_SECONDS: u64 = 5;
+pub const HEARTBEAT_INTERVAL_SECONDS: u64 = 15;
 
 /// Spawns a thread that can be used to run code periodically, on `HEARTBEAT_INTERVAL_SECONDS`
 /// durations.
@@ -25,19 +25,22 @@ pub fn run<T: BeaconChainTypes + Send + Sync + 'static>(
         Duration::from_secs(HEARTBEAT_INTERVAL_SECONDS),
     );
 
-    let _log = client.log.new(o!("Service" => "Notifier"));
+    let log = client.log.new(o!("Service" => "Notifier"));
+
+    let libp2p = client.network.libp2p_service();
+
+    let heartbeat = move |_| {
+        // Notify the number of connected nodes
+        // Panic if libp2p is poisoned
+        debug!(log, ""; "Connected Peers" => libp2p.lock().swarm.connected_peers());
 
-    let heartbeat = |_| {
-        // There is not presently any heartbeat logic.
-        //
-        // We leave this function empty for future use.
         Ok(())
     };
 
     // map error and spawn
-    let log = client.log.clone();
+    let err_log = client.log.clone();
     let heartbeat_interval = interval
-        .map_err(move |e| debug!(log, "Timer error {}", e))
+        .map_err(move |e| debug!(err_log, "Timer error {}", e))
         .for_each(heartbeat);
 
     executor.spawn(exit.until(heartbeat_interval).map(|_| ()));
diff --git a/beacon_node/eth2-libp2p/src/behaviour.rs b/beacon_node/eth2-libp2p/src/behaviour.rs
index 1bff58ecdf..9a30a60b96 100644
--- a/beacon_node/eth2-libp2p/src/behaviour.rs
+++ b/beacon_node/eth2-libp2p/src/behaviour.rs
@@ -171,6 +171,11 @@ impl<TSubstream: AsyncRead + AsyncWrite> Behaviour<TSubstream> {
     pub fn send_rpc(&mut self, peer_id: PeerId, rpc_event: RPCEvent) {
         self.serenity_rpc.send_rpc(peer_id, rpc_event);
     }
+
+    /* Discovery / Peer management functions */
+    pub fn connected_peers(&self) -> usize {
+        self.discovery.connected_peers()
+    }
 }
 
 /// The types of events than can be obtained from polling the behaviour.
diff --git a/beacon_node/eth2-libp2p/src/discovery.rs b/beacon_node/eth2-libp2p/src/discovery.rs
index 49e5dbeb56..29725ff36d 100644
--- a/beacon_node/eth2-libp2p/src/discovery.rs
+++ b/beacon_node/eth2-libp2p/src/discovery.rs
@@ -106,6 +106,11 @@ impl<TSubstream> Discovery<TSubstream> {
         self.discovery.add_enr(enr);
     }
 
+    /// The current number of connected libp2p peers.
+    pub fn connected_peers(&self) -> usize {
+        self.connected_peers.len()
+    }
+
     /// Search for new peers using the underlying discovery mechanism.
     fn find_peers(&mut self) {
         // pick a random NodeId
diff --git a/beacon_node/network/Cargo.toml b/beacon_node/network/Cargo.toml
index 1499ac5808..9eadede76e 100644
--- a/beacon_node/network/Cargo.toml
+++ b/beacon_node/network/Cargo.toml
@@ -19,3 +19,4 @@ tree_hash = { path = "../../eth2/utils/tree_hash" }
 futures = "0.1.25"
 error-chain = "0.12.0"
 tokio = "0.1.16"
+parking_lot = "0.9.0"
diff --git a/beacon_node/network/src/message_handler.rs b/beacon_node/network/src/message_handler.rs
index 2395470781..b1d88415c3 100644
--- a/beacon_node/network/src/message_handler.rs
+++ b/beacon_node/network/src/message_handler.rs
@@ -105,7 +105,7 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
     fn handle_rpc_message(&mut self, peer_id: PeerId, rpc_message: RPCEvent) {
         match rpc_message {
             RPCEvent::Request(id, req) => self.handle_rpc_request(peer_id, id, req),
-            RPCEvent::Response(id, resp) => self.handle_rpc_response(peer_id, id, resp),
+            RPCEvent::Response(_id, resp) => self.handle_rpc_response(peer_id, resp),
             RPCEvent::Error(id, error) => self.handle_rpc_error(peer_id, id, error),
         }
     }
@@ -148,18 +148,10 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
 
     /// An RPC response has been received from the network.
     // we match on id and ignore responses past the timeout.
-    fn handle_rpc_response(
-        &mut self,
-        peer_id: PeerId,
-        id: RequestId,
-        error_response: RPCErrorResponse,
-    ) {
+    fn handle_rpc_response(&mut self, peer_id: PeerId, error_response: RPCErrorResponse) {
         // an error could have occurred.
         // TODO: Handle Error gracefully
         match error_response {
-            RPCErrorResponse::EncodingError => {
-                warn!(self.log, "Encoding Error"; "peer" => format!("{:?}", peer_id), "request_id" => format!("{}",id))
-            }
             RPCErrorResponse::InvalidRequest(error) => {
                 warn!(self.log, "";"peer" => format!("{:?}", peer_id), "Invalid Request" => error.as_string())
             }
diff --git a/beacon_node/network/src/service.rs b/beacon_node/network/src/service.rs
index 0c0af367a8..a771f8add4 100644
--- a/beacon_node/network/src/service.rs
+++ b/beacon_node/network/src/service.rs
@@ -8,6 +8,7 @@ use eth2_libp2p::{Libp2pEvent, PeerId};
 use eth2_libp2p::{PubsubMessage, RPCEvent};
 use futures::prelude::*;
 use futures::Stream;
+use parking_lot::Mutex;
 use slog::{debug, info, o, trace};
 use std::marker::PhantomData;
 use std::sync::Arc;
@@ -16,9 +17,9 @@ use tokio::sync::{mpsc, oneshot};
 
 /// Service that handles communication between internal services and the eth2_libp2p network service.
 pub struct Service<T: BeaconChainTypes> {
-    //libp2p_service: Arc<Mutex<LibP2PService>>,
+    libp2p_service: Arc<Mutex<LibP2PService>>,
     _libp2p_exit: oneshot::Sender<()>,
-    network_send: mpsc::UnboundedSender<NetworkMessage>,
+    _network_send: mpsc::UnboundedSender<NetworkMessage>,
     _phantom: PhantomData<T>, //message_handler: MessageHandler,
                               //message_handler_send: Sender<HandlerMessage>
 }
@@ -43,38 +44,33 @@ impl<T: BeaconChainTypes + 'static> Service<T> {
 
         // launch libp2p service
         let libp2p_log = log.new(o!("Service" => "Libp2p"));
-        let libp2p_service = LibP2PService::new(config.clone(), libp2p_log)?;
+        let libp2p_service = Arc::new(Mutex::new(LibP2PService::new(config.clone(), libp2p_log)?));
 
         // TODO: Spawn thread to handle libp2p messages and pass to message handler thread.
         let libp2p_exit = spawn_service(
-            libp2p_service,
+            libp2p_service.clone(),
             network_recv,
             message_handler_send,
             executor,
             log,
         )?;
         let network_service = Service {
+            libp2p_service,
             _libp2p_exit: libp2p_exit,
-            network_send: network_send.clone(),
+            _network_send: network_send.clone(),
             _phantom: PhantomData,
         };
 
         Ok((Arc::new(network_service), network_send))
     }
 
-    // TODO: Testing only
-    pub fn send_message(&mut self) {
-        self.network_send
-            .try_send(NetworkMessage::Send(
-                PeerId::random(),
-                OutgoingMessage::NotifierTest,
-            ))
-            .unwrap();
+    pub fn libp2p_service(&self) -> Arc<Mutex<LibP2PService>> {
+        self.libp2p_service.clone()
     }
 }
 
 fn spawn_service(
-    libp2p_service: LibP2PService,
+    libp2p_service: Arc<Mutex<LibP2PService>>,
     network_recv: mpsc::UnboundedReceiver<NetworkMessage>,
     message_handler_send: mpsc::UnboundedSender<HandlerMessage>,
     executor: &TaskExecutor,
@@ -103,7 +99,7 @@ fn spawn_service(
 
 //TODO: Potentially handle channel errors
 fn network_service(
-    mut libp2p_service: LibP2PService,
+    libp2p_service: Arc<Mutex<LibP2PService>>,
     mut network_recv: mpsc::UnboundedReceiver<NetworkMessage>,
     mut message_handler_send: mpsc::UnboundedSender<HandlerMessage>,
     log: slog::Logger,
@@ -115,28 +111,18 @@ fn network_service(
             not_ready_count = 0;
             // poll the network channel
             match network_recv.poll() {
-                Ok(Async::Ready(Some(message))) => {
-                    match message {
-                        // TODO: Testing message - remove
-                        NetworkMessage::Send(peer_id, outgoing_message) => {
-                            match outgoing_message {
-                                OutgoingMessage::RPC(rpc_event) => {
-                                    trace!(log, "Sending RPC Event: {:?}", rpc_event);
-                                    //TODO: Make swarm private
-                                    //TODO: Implement correct peer id topic message handling
-                                    libp2p_service.swarm.send_rpc(peer_id, rpc_event);
-                                }
-                                OutgoingMessage::NotifierTest => {
-                                    // debug!(log, "Received message from notifier");
-                                }
-                            };
-                        }
-                        NetworkMessage::Publish { topics, message } => {
-                            debug!(log, "Sending pubsub message"; "topics" => format!("{:?}",topics));
-                            libp2p_service.swarm.publish(topics, *message);
+                Ok(Async::Ready(Some(message))) => match message {
+                    NetworkMessage::Send(peer_id, outgoing_message) => match outgoing_message {
+                        OutgoingMessage::RPC(rpc_event) => {
+                            trace!(log, "Sending RPC Event: {:?}", rpc_event);
+                            libp2p_service.lock().swarm.send_rpc(peer_id, rpc_event);
                         }
+                    },
+                    NetworkMessage::Publish { topics, message } => {
+                        debug!(log, "Sending pubsub message"; "topics" => format!("{:?}",topics));
+                        libp2p_service.lock().swarm.publish(topics, *message);
                     }
-                }
+                },
                 Ok(Async::NotReady) => not_ready_count += 1,
                 Ok(Async::Ready(None)) => {
                     return Err(eth2_libp2p::error::Error::from("Network channel closed"));
@@ -147,7 +133,7 @@ fn network_service(
             }
 
             // poll the swarm
-            match libp2p_service.poll() {
+            match libp2p_service.lock().poll() {
                 Ok(Async::Ready(Some(event))) => match event {
                     Libp2pEvent::RPC(peer_id, rpc_event) => {
                         trace!(log, "RPC Event: RPC message received: {:?}", rpc_event);
@@ -182,6 +168,7 @@ fn network_service(
                 Err(_) => not_ready_count += 1,
             }
         }
+
         Ok(Async::NotReady)
     })
 }
@@ -204,6 +191,4 @@ pub enum NetworkMessage {
 pub enum OutgoingMessage {
     /// Send an RPC request/response.
     RPC(RPCEvent),
-    //TODO: Remove
-    NotifierTest,
 }