diff --git a/src/mnode_proto_ping_server.cc b/src/mnode_proto_ping_server.cc
index 1cec3b2..64b71f8 100644
--- a/src/mnode_proto_ping_server.cc
+++ b/src/mnode_proto_ping_server.cc
@@ -4,113 +4,43 @@
 #include <mesytec-mvlc/util/signal_handling.h>
 #include "proto/service.pb.h"
 #include <mesytec-mnode/mnode_nng_async.h>
+#include "internal/argh.h"
 
 using namespace mesytec;
 using namespace mesytec::mnode;
 using namespace std::literals;
 
-void server_cb(void *arg);
-
-class Work
+class PingServer: public nng::AsyncRepWork
 {
   public:
-    explicit Work(nng_socket socket)
-        : socket(socket)
+    explicit PingServer(nng_socket socket)
+        : AsyncRepWork(socket)
     {
-        recvErrors_.fill(0);
-        sendErrors_.fill(0);
     }
 
-    ~Work()
-    {
-        nng_ctx_close(ctx);
-        nng_aio_free(aio);
-    }
-
-    void work()
-    {
-        switch (state)
-        {
-        case INIT:
-            nng_aio_alloc(&aio, server_cb, this);
-            nng_ctx_open(&ctx, socket);
-            state = RECEIVE;
-            nng_ctx_recv(ctx, aio);
-            break;
-
-        case RECEIVE:
-            if (auto rv = nng_aio_result(aio))
-            {
-                if (rv != NNG_ETIMEDOUT)
-                    nng::mnode_nng_error("nng_ctx_recv", rv);
-                if (rv < static_cast<int>(recvErrors_.size()))
-                    ++recvErrors_[rv];
-                state = RECEIVE;
-                nng_ctx_recv(ctx, aio);
-                break;
-            }
-            else
-            {
-                auto reply = handle_request(nng::make_unique_msg(nng_aio_get_msg(aio)));
-                nng_aio_set_msg(aio, reply.release());
-                state = SEND;
-                nng_ctx_send(ctx, aio);
-            }
-            break;
-
-        case SEND:
-            if (auto rv = nng_aio_result(aio))
-            {
-                nng::mnode_nng_error("nng_ctx_send", rv);
-                if (rv < static_cast<int>(sendErrors_.size()))
-                    ++sendErrors_[rv];
-                nng::make_unique_msg(nng_aio_get_msg(aio)).reset();
-            }
-            state = RECEIVE;
-            nng_ctx_recv(ctx, aio);
-            break;
-        }
-    }
-
-    nng::unique_msg handle_request(nng::unique_msg &&msg)
+    nng::unique_msg handle_request(nng::unique_msg &&msg) override
     {
         ping_.ParseFromArray(nng_msg_body(msg.get()), nng_msg_len(msg.get()));
         pong_.set_peer_id(ping_.peer_id());
         pong_.set_sequence_number(ping_.sequence_number());
-        sequence_number = ping_.sequence_number();
-        return nng::make_message(ping_.SerializeAsString());
+        ++num_transactions;
+        return nng::make_message(pong_.SerializeAsString());
     }
 
     void report()
     {
-        spdlog::info("Work: state={}, sequence_number={}", static_cast<int>(state), sequence_number);
+        spdlog::info("PingServer, peer_id={}, transactions={}", peer_id, num_transactions);
     }
 
   private:
-    enum State
-    {
-        INIT,    // allocate aio, open ctx, receive first request
-        RECEIVE, // receive request
-        SEND,    // send response
-    };
-
-    mnode::Ping ping_;
-    mnode::Pong pong_;
-    std::uint32_t sequence_number = 0;
-    State state = INIT;
-    nng_socket socket;
-    nng_aio *aio = nullptr;
-    nng_ctx ctx;
-    std::array<size_t, 64> recvErrors_;
-    std::array<size_t, 64> sendErrors_;
-
+    Ping ping_;
+    Pong pong_;
+    static std::atomic<size_t> next_peer_id;
+    size_t peer_id = next_peer_id++;
+    size_t num_transactions = 0;
 };
 
-void server_cb(void *arg)
-{
-    auto work = static_cast<Work *>(arg);
-    work->work();
-}
+std::atomic<size_t> PingServer::next_peer_id;
 
 int main()
 {
@@ -125,16 +55,24 @@ int main()
     }
 
     mvlc::util::Stopwatch sw;
-    Work work(socket);
-    work.work();
+    std::vector<std::unique_ptr<PingServer>> servers;
+
+    for (int i = 0; i < 10; ++i)
+        servers.emplace_back(std::make_unique<PingServer>(socket));
+
+    for (auto &server: servers)
+        server->work();
 
     for (;;)
     {
         nng_msleep(100);
         if (sw.get_interval() >= 1s)
         {
-            work.report();
+            for (auto &server: servers)
+                server->report();
             sw.interval();
         }
     }
+
+    return 0;
 }