diff --git a/src/NVMeContext.cpp b/src/NVMeContext.cpp
new file mode 100644
index 0000000..c421d1f
--- /dev/null
+++ b/src/NVMeContext.cpp
@@ -0,0 +1,428 @@
+/*
+// Copyright (c) 2019 Intel Corporation
+//
+// 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 "NVMeContext.hpp"
+
+#include "NVMeDevice.hpp"
+
+#include <crc32c.h>
+#include <libmctp-smbus.h>
+#include <libmctp.h>
+
+#include <boost/container/flat_map.hpp>
+
+static constexpr bool debug = false;
+
+static void rxMessage(uint8_t eid, void* data, void* msg, size_t len);
+
+namespace nvmeMCTP
+{
+struct mctp_binding_smbus* smbus = mctp_smbus_init();
+struct mctp* mctp = mctp_init();
+
+static boost::container::flat_map<int, int> inFds;
+static boost::container::flat_map<int, int> outFds;
+
+int getInFd(int rootBus)
+{
+    auto findBus = inFds.find(rootBus);
+    if (findBus != inFds.end())
+    {
+        return findBus->second;
+    }
+    int fd = mctp_smbus_open_in_bus(smbus, rootBus);
+    if (fd < 0)
+    {
+        std::cerr << "Error opening IN Bus " << rootBus << "\n";
+    }
+    inFds[rootBus] = fd;
+    return fd;
+}
+
+int getOutFd(int bus)
+{
+    auto findBus = outFds.find(bus);
+    if (findBus != outFds.end())
+    {
+        return findBus->second;
+    }
+    int fd = mctp_smbus_open_out_bus(smbus, bus);
+    if (fd < 0)
+    {
+        std::cerr << "Error opening Out Bus " << bus << "\n";
+    }
+    outFds[bus] = fd;
+    return fd;
+}
+
+// we don't close the outFd as multiple sensors could be sharing the fd, we need
+// to close the inFd as it can only be used on 1 socket at a time
+void closeInFd(int rootBus)
+{
+    auto findFd = inFds.find(rootBus);
+    if (findFd == inFds.end())
+    {
+        return;
+    }
+    close(findFd->second);
+    inFds.erase(rootBus);
+}
+
+int getRootBus(int inFd)
+{
+    // we assume that we won't have too many FDs, so looping is OK
+    for (const auto [root, fd] : inFds)
+    {
+        if (fd == inFd)
+        {
+            return root;
+        }
+    }
+
+    return -1;
+}
+
+void init()
+{
+    if (mctp == nullptr || smbus == nullptr)
+    {
+        throw std::runtime_error("Unable to init mctp");
+    }
+    mctp_smbus_register_bus(smbus, nvmeMCTP::mctp, 0);
+    mctp_set_rx_all(mctp, rxMessage, nullptr);
+}
+
+} // namespace nvmeMCTP
+
+static int verifyIntegrity(uint8_t* msg, size_t len)
+{
+    uint32_t msgIntegrity = {0};
+    if (len < NVME_MI_MSG_RESPONSE_HEADER_SIZE + sizeof(msgIntegrity))
+    {
+        std::cerr << "Not enough bytes for nvme header and trailer\n";
+        return -1;
+    }
+
+    msgIntegrity = (msg[len - 4]) + (msg[len - 3] << 8) + (msg[len - 2] << 16) +
+                   (msg[len - 1] << 24);
+
+    uint32_t calculateIntegrity = crc32c(msg, len - sizeof(msgIntegrity));
+    if (msgIntegrity != calculateIntegrity)
+    {
+        std::cerr << "CRC mismatch. Got=" << msgIntegrity
+                  << " Expected=" << calculateIntegrity << "\n";
+        return -1;
+    }
+    return 0;
+}
+
+static double getTemperatureReading(int8_t reading)
+{
+
+    if (reading == static_cast<int8_t>(0x80) ||
+        reading == static_cast<int8_t>(0x81))
+    {
+        // 0x80 = No temperature data or temperature data is more the 5 s
+        // old 0x81 = Temperature sensor failure
+        return std::numeric_limits<double>::quiet_NaN();
+    }
+
+    return reading;
+}
+
+static void rxMessage(uint8_t eid, void*, void* msg, size_t len)
+{
+    struct nvme_mi_msg_response_header header
+    {};
+
+    int inFd = mctp_smbus_get_in_fd(nvmeMCTP::smbus);
+    int rootBus = nvmeMCTP::getRootBus(inFd);
+
+    NVMEMap& nvmeMap = getNVMEMap();
+    auto findMap = nvmeMap.find(rootBus);
+    if (findMap == nvmeMap.end())
+    {
+        std::cerr << "Unable to lookup root bus " << rootBus << "\n";
+        return;
+    }
+    std::shared_ptr<NVMeContext>& self = findMap->second;
+
+    if (msg == nullptr)
+    {
+        std::cerr << "Bad message received\n";
+        return;
+    }
+
+    if (len <= 0)
+    {
+        std::cerr << "Received message not long enough\n";
+        return;
+    }
+
+    if (debug)
+    {
+        std::cout << "Eid from the received messaged: " << eid << "\n";
+    }
+
+    uint8_t* messageData = static_cast<uint8_t*>(msg);
+
+    if ((*messageData & NVME_MI_MESSAGE_TYPE_MASK) != NVME_MI_MESSAGE_TYPE)
+    {
+        std::cerr << "Got unknown type message_type="
+                  << (*messageData & NVME_MI_MESSAGE_TYPE_MASK) << "\n";
+        return;
+    }
+
+    if (len < NVME_MI_MSG_RESPONSE_HEADER_SIZE + sizeof(uint32_t))
+    {
+        std::cerr << "Not enough bytes for NVMe header and trailer\n";
+        return;
+    }
+
+    if (verifyIntegrity(messageData, len) != 0)
+    {
+        std::cerr << "Verification of message integrity failed\n";
+        return;
+    }
+
+    header.message_type = messageData[0];
+    header.flags = messageData[1];
+    header.status = messageData[4];
+
+    if (header.status == NVME_MI_HDR_STATUS_MORE_PROCESSING_REQUIRED)
+    {
+        return;
+    }
+
+    if (header.status != NVME_MI_HDR_STATUS_SUCCESS)
+    {
+        std::cerr << "Command failed with status= " << header.status << "\n";
+        return;
+    }
+
+    messageData += NVME_MI_MSG_RESPONSE_HEADER_SIZE;
+    size_t messageLength =
+        len - NVME_MI_MSG_RESPONSE_HEADER_SIZE - sizeof(uint32_t);
+    if (((header.flags >> NVME_MI_HDR_FLAG_MSG_TYPE_SHIFT) &
+         NVME_MI_HDR_FLAG_MSG_TYPE_MASK) != NVME_MI_HDR_MESSAGE_TYPE_MI_COMMAND)
+    {
+        std::cerr << "Not MI type comamnd\n";
+        return;
+    }
+
+    if (messageLength < NVME_MI_HEALTH_STATUS_POLL_MSG_MIN)
+    {
+        std::cerr << "Got improperly sized health status poll\n";
+        return;
+    }
+
+    std::shared_ptr<NVMeSensor> sensorInfo = self->sensors.front();
+    if (debug)
+    {
+        std::cout << "Temperature Reading: "
+                  << getTemperatureReading(messageData[5])
+                  << " Celsius for device " << sensorInfo->name << "\n";
+    }
+
+    double value = getTemperatureReading(messageData[5]);
+    if (!std::isfinite(value))
+    {
+        sensorInfo->markAvailable(false);
+        sensorInfo->incrementError();
+    }
+    else
+    {
+        sensorInfo->updateValue(value);
+    }
+
+    if (debug)
+    {
+        std::cout << "Cancelling the timer now\n";
+    }
+
+    // move to back of scan queue
+    self->sensors.pop_front();
+    self->sensors.emplace_back(sensorInfo);
+
+    self->mctpResponseTimer.cancel();
+}
+
+static int nvmeMessageTransmit(mctp& mctp, nvme_mi_msg_request& req)
+{
+    std::array<uint8_t, NVME_MI_MSG_BUFFER_SIZE> messageBuf = {};
+
+    req.header.flags |= NVME_MI_HDR_MESSAGE_TYPE_MI_COMMAND
+                        << NVME_MI_HDR_FLAG_MSG_TYPE_SHIFT;
+    req.header.message_type =
+        NVME_MI_MESSAGE_TYPE | NVME_MI_MCTP_INTEGRITY_CHECK;
+
+    uint32_t integrity = 0;
+    size_t msgSize = NVME_MI_MSG_REQUEST_HEADER_SIZE + req.request_data_len +
+                     sizeof(integrity);
+
+    if (sizeof(messageBuf) < msgSize)
+    {
+        return EXIT_FAILURE;
+    }
+
+    messageBuf[0] = req.header.message_type;
+    messageBuf[1] = req.header.flags;
+    // Reserved bytes 2-3
+
+    messageBuf[4] = req.header.opcode;
+    // reserved bytes 5-7
+    messageBuf[8] = req.header.dword0 & 0xff;
+    messageBuf[9] = (req.header.dword0 >> 8) & 0xff;
+    messageBuf[10] = (req.header.dword0 >> 16) & 0xff;
+    messageBuf[11] = (req.header.dword0 >> 24) & 0xff;
+
+    messageBuf[12] = req.header.dword1 & 0xff;
+    messageBuf[13] = (req.header.dword1 >> 8) & 0xff;
+    messageBuf[14] = (req.header.dword1 >> 16) & 0xff;
+    messageBuf[15] = (req.header.dword1 >> 24) & 0xff;
+
+    std::copy_n(req.request_data, req.request_data_len,
+                messageBuf.data() +
+                    static_cast<uint8_t>(NVME_MI_MSG_REQUEST_HEADER_SIZE));
+
+    msgSize = NVME_MI_MSG_REQUEST_HEADER_SIZE + req.request_data_len;
+    integrity = crc32c(messageBuf.data(),
+                       NVME_MI_MSG_REQUEST_HEADER_SIZE + req.request_data_len);
+    messageBuf[msgSize] = integrity & 0xff;
+    messageBuf[msgSize + 1] = (integrity >> 8) & 0xff;
+    messageBuf[msgSize + 2] = (integrity >> 16) & 0xff;
+    messageBuf[msgSize + 3] = (integrity >> 24) & 0xff;
+    msgSize += sizeof(integrity);
+
+    return mctp_message_tx(&mctp, 0, messageBuf.data(), msgSize);
+}
+
+static void readResponse(const std::shared_ptr<NVMeContext>& nvmeDevice)
+{
+    nvmeDevice->nvmeSlaveSocket.async_wait(
+        boost::asio::ip::tcp::socket::wait_error,
+        [nvmeDevice](const boost::system::error_code errorCode) {
+            if (errorCode)
+            {
+                return;
+            }
+
+            mctp_smbus_set_in_fd(nvmeMCTP::smbus,
+                                 nvmeMCTP::getInFd(nvmeDevice->rootBus));
+
+            // through libmctp this will invoke rxMessage
+            mctp_smbus_read(nvmeMCTP::smbus);
+        });
+}
+
+static void
+    readAndProcessNVMeSensor(const std::shared_ptr<NVMeContext>& nvmeDevice)
+{
+    struct nvme_mi_msg_request requestMsg = {};
+    requestMsg.header.opcode = NVME_MI_OPCODE_HEALTH_STATUS_POLL;
+    requestMsg.header.dword0 = 0;
+    requestMsg.header.dword1 = 0;
+
+    int mctpResponseTimeout = 1;
+
+    if (nvmeDevice->sensors.empty())
+    {
+        return;
+    }
+
+    std::shared_ptr<NVMeSensor>& sensor = nvmeDevice->sensors.front();
+
+    // setup the timeout timer
+    nvmeDevice->mctpResponseTimer.expires_from_now(
+        boost::posix_time::seconds(mctpResponseTimeout));
+
+    nvmeDevice->mctpResponseTimer.async_wait(
+        [sensor, nvmeDevice](const boost::system::error_code errorCode) {
+            if (errorCode)
+            {
+                // timer cancelled successfully
+                return;
+            }
+
+            sensor->incrementError();
+
+            // cycle it back
+            nvmeDevice->sensors.pop_front();
+            nvmeDevice->sensors.emplace_back(sensor);
+
+            nvmeDevice->nvmeSlaveSocket.cancel();
+        });
+
+    readResponse(nvmeDevice);
+
+    if (debug)
+    {
+        std::cout << "Sending message to read data from Drive on bus: "
+                  << sensor->bus << " , rootBus: " << nvmeDevice->rootBus
+                  << " device: " << sensor->name << "\n";
+    }
+
+    mctp_smbus_set_out_fd(nvmeMCTP::smbus, nvmeMCTP::getOutFd(sensor->bus));
+    int rc = nvmeMessageTransmit(*nvmeMCTP::mctp, requestMsg);
+
+    if (rc != 0)
+    {
+        std::cerr << "Error sending request message to NVMe device\n";
+    }
+}
+
+NVMeContext::NVMeContext(boost::asio::io_service& io, int rootBus) :
+    scanTimer(io), rootBus(rootBus), mctpResponseTimer(io), nvmeSlaveSocket(io)
+{
+    nvmeSlaveSocket.assign(boost::asio::ip::tcp::v4(),
+                           nvmeMCTP::getInFd(rootBus));
+}
+
+void NVMeContext::pollNVMeDevices()
+{
+    scanTimer.expires_from_now(boost::posix_time::seconds(1));
+    scanTimer.async_wait(
+        [self{shared_from_this()}](const boost::system::error_code errorCode) {
+            if (errorCode == boost::asio::error::operation_aborted)
+            {
+                return; // we're being canceled
+            }
+            else if (errorCode)
+            {
+                std::cerr << "Error:" << errorCode.message() << "\n";
+                return;
+            }
+            else
+            {
+                readAndProcessNVMeSensor(self);
+            }
+
+            self->pollNVMeDevices();
+        });
+}
+
+void NVMeContext::close()
+{
+    scanTimer.cancel();
+    mctpResponseTimer.cancel();
+    nvmeSlaveSocket.cancel();
+    nvmeMCTP::closeInFd(rootBus);
+}
+
+NVMeContext::~NVMeContext()
+{
+    close();
+}