diff --git a/subprojects/nemora-postd/src/host_manager.cpp b/subprojects/nemora-postd/src/host_manager.cpp
new file mode 100644
index 0000000..b27ac21
--- /dev/null
+++ b/subprojects/nemora-postd/src/host_manager.cpp
@@ -0,0 +1,111 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "host_manager.hpp"
+
+#include <fmt/format.h>
+
+#include <phosphor-logging/log.hpp>
+#include <sdbusplus/bus.hpp>
+#include <sdbusplus/message.hpp>
+
+#include <functional>
+#include <iostream>
+#include <variant>
+
+using fmt::format;
+using phosphor::logging::level;
+using phosphor::logging::log;
+
+HostManager::HostManager() :
+    postcodes_(), bus_(sdbusplus::bus::new_default()),
+    signal_(bus_, HostManager::GetMatch().c_str(),
+            [this](auto& m) -> void { this->DbusHandleSignal(m); }),
+    post_poller_enabled_(true)
+{
+    // Spin off thread to listen on bus_
+    auto post_poller_thread = std::mem_fn(&HostManager::PostPollerThread);
+    post_poller_ = std::make_unique<std::thread>(post_poller_thread, this);
+}
+
+int HostManager::DbusHandleSignal(sdbusplus::message::message& msg)
+{
+    log<level::INFO>("Property Changed!");
+    std::string msgSensor, busName{POSTCODE_BUSNAME};
+    std::map<std::string,
+             std::variant<std::tuple<uint64_t, std::vector<uint8_t>>>>
+        msgData;
+    msg.read(msgSensor, msgData);
+
+    if (msgSensor == busName)
+    {
+        auto valPropMap = msgData.find("Value");
+        if (valPropMap != msgData.end())
+        {
+            uint64_t rawValue =
+                std::get<uint64_t>(std::get<0>(valPropMap->second));
+
+            PushPostcode(rawValue);
+        }
+    }
+
+    return 0;
+}
+
+void HostManager::PushPostcode(uint64_t postcode)
+{
+    // Get lock
+    std::lock_guard<std::mutex> lock(postcodes_lock_);
+    // Add postcode to queue
+    postcodes_.push_back(postcode);
+}
+
+std::vector<uint64_t> HostManager::DrainPostcodes()
+{
+    // Get lock
+    std::lock_guard<std::mutex> lock(postcodes_lock_);
+
+    auto count = postcodes_.size();
+    if (count > 0)
+    {
+        std::string msg = format("Draining Postcodes. Count: {}.", count);
+        log<level::ERR>(msg.c_str());
+    }
+
+    // Drain the queue into a list
+    // TODO: maximum # postcodes?
+    std::vector<uint64_t> result(postcodes_);
+    postcodes_.clear();
+
+    return result;
+}
+
+std::string HostManager::GetMatch()
+{
+    std::string obj{POSTCODE_OBJECTPATH};
+    return std::string("type='signal',"
+                       "interface='org.freedesktop.DBus.Properties',"
+                       "member='PropertiesChanged',"
+                       "path='" +
+                       obj + "'");
+}
+
+void HostManager::PostPollerThread()
+{
+    while (post_poller_enabled_)
+    {
+        bus_.process_discard();
+        bus_.wait();
+    }
+}