diff --git a/libpldm/state_set.h b/libpldm/state_set.h
index 7bc364c..3a0528e 100644
--- a/libpldm/state_set.h
+++ b/libpldm/state_set.h
@@ -150,6 +150,18 @@
 	PLDM_STATE_SET_OPERATIONAL_RUNNING_STATUS_DORMANT = 6
 };
 
+/* @brief List of states for the Software-related state set (ID 129).
+ */
+enum pldm_software_termination_status_values {
+	PLDM_SW_TERM_NORMAL = 1,
+	PLDM_SW_TERM_SOFTWARE_TERMINATION_DETECTED = 2,
+	PLDM_SW_TERM_CRITICAL_STOP_DURING_LOAD_INITIALIZATION = 3,
+	PLDM_SW_TERM_RUN_TIME_CRITICAL_STOP = 4,
+	PLDM_SW_TERM_GRACEFUL_SHUTDOWN_REQUESTED = 5,
+	PLDM_SW_TERM_GRACEFUL_RESTART_REQUESTED = 6,
+	PLDM_SW_TERM_GRACEFUL_SHUTDOWN = 7,
+	PLDM_SW_TERM_TERMINATION_REQUEST_FAILED = 8,
+};
 #ifdef __cplusplus
 }
 #endif
diff --git a/softoff/main.cpp b/softoff/main.cpp
index e56a008..4ff2a4d 100644
--- a/softoff/main.cpp
+++ b/softoff/main.cpp
@@ -1,8 +1,55 @@
-#include "libpldm/platform.h"
+#include "common/utils.hpp"
+#include "softoff.hpp"
 
 #include <iostream>
 
 int main()
 {
+    // Get a default event loop
+    auto event = sdeventplus::Event::get_default();
+
+    // Get a handle to system D-Bus.
+    auto& bus = pldm::utils::DBusHandler::getBus();
+
+    // Attach the bus to sd_event to service user requests
+    bus.attach_event(event.get(), SD_EVENT_PRIORITY_NORMAL);
+
+    pldm::SoftPowerOff softPower(bus, event.get());
+
+    if (softPower.isError())
+    {
+        std::cerr << "Host failed to gracefully shutdown, exiting "
+                     "pldm-softpoweroff app\n";
+        return -1;
+    }
+
+    if (softPower.isCompleted())
+    {
+        std::cerr << "Host current state is not Running, exiting "
+                     "pldm-softpoweroff app\n";
+        return 0;
+    }
+
+    // Send the gracefully shutdown request to the host and
+    // wait the host gracefully shutdown.
+    if (softPower.hostSoftOff(event))
+    {
+        std::cerr << "pldm-softpoweroff:Failure in sending soft off request to "
+                     "the host. Exiting pldm-softpoweroff app\n";
+
+        return -1;
+    }
+
+    if (softPower.isTimerExpired() && softPower.isReceiveResponse())
+    {
+        pldm::utils::reportError(
+            "pldm soft off: Waiting for the host soft off timeout");
+        std::cerr
+            << "PLDM host soft off: ERROR! Wait for the host soft off timeout."
+            << "Exit the pldm-softpoweroff "
+            << "\n";
+        return -1;
+    }
+
     return 0;
 }
diff --git a/softoff/meson.build b/softoff/meson.build
index 09c9d2c..753375b 100644
--- a/softoff/meson.build
+++ b/softoff/meson.build
@@ -1,9 +1,24 @@
-deps = [ libpldm ]
+deps = [
+    libpldm,
+    libpldmutils,
+    dependency('sdeventplus'),
+    dependency('sdbusplus'),
+    dependency('phosphor-dbus-interfaces'),
+    ]
 
-source = ['main.cpp']
+source = ['main.cpp','softoff.cpp']
 
 executable('pldm-softpoweroff',source,
            implicit_include_directories: false,
            dependencies: deps,
            install: true,
            install_dir: get_option('bindir'))
+
+systemd = dependency('systemd')
+servicedir = systemd.get_pkgconfig_variable('systemdsystemunitdir')
+
+configure_file(input: 'services/pldmSoftPowerOff.service',
+                 output: 'pldmSoftPowerOff.service',
+                 copy: true,
+                 install_dir: servicedir)
+
diff --git a/softoff/services/pldmSoftPowerOff.service b/softoff/services/pldmSoftPowerOff.service
new file mode 100644
index 0000000..80960cd
--- /dev/null
+++ b/softoff/services/pldmSoftPowerOff.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=PLDM soft power off app
+Wants=pldmd.service
+After=pldmd.service
+Wants=obmc-host-stopping@0.target
+Before=obmc-host-stopping@0.target
+Conflicts=obmc-host-start@0.target
+
+[Service]
+Restart=no
+ExecStart=/usr/bin/pldm-softpoweroff
+Type=oneshot
diff --git a/softoff/softoff.cpp b/softoff/softoff.cpp
new file mode 100644
index 0000000..c2f2051
--- /dev/null
+++ b/softoff/softoff.cpp
@@ -0,0 +1,434 @@
+#include "config.h"
+
+#include "softoff.hpp"
+
+#include "libpldm/entity.h"
+#include "libpldm/platform.h"
+#include "libpldm/requester/pldm.h"
+#include "libpldm/state_set.h"
+
+#include "common/utils.hpp"
+
+#include <sdbusplus/bus.hpp>
+#include <sdeventplus/clock.hpp>
+#include <sdeventplus/source/io.hpp>
+#include <sdeventplus/source/time.hpp>
+
+#include <array>
+#include <iostream>
+
+namespace pldm
+{
+
+using namespace sdeventplus;
+using namespace sdeventplus::source;
+constexpr auto clockId = sdeventplus::ClockId::RealTime;
+using Clock = Clock<clockId>;
+using Timer = Time<clockId>;
+
+using sdbusplus::exception::SdBusError;
+
+constexpr pldm::pdr::TerminusID TID = 0; // TID will be implemented later.
+namespace sdbusRule = sdbusplus::bus::match::rules;
+
+SoftPowerOff::SoftPowerOff(sdbusplus::bus::bus& bus, sd_event* event) :
+    bus(bus), timer(event)
+{
+    auto rc = getHostState();
+    if (hasError || completed)
+    {
+        return;
+    }
+
+    rc = getEffecterID();
+    if (rc != PLDM_SUCCESS)
+    {
+        hasError = true;
+        return;
+    }
+
+    rc = getSensorInfo();
+    if (rc != PLDM_SUCCESS)
+    {
+        std::cerr << "Message get Sensor PDRs error. PLDM "
+                     "error code = "
+                  << std::hex << std::showbase << rc << "\n";
+        hasError = true;
+        return;
+    }
+
+    // Matches on the pldm StateSensorEvent signal
+    pldmEventSignal = std::make_unique<sdbusplus::bus::match_t>(
+        bus,
+        sdbusRule::type::signal() + sdbusRule::member("StateSensorEvent") +
+            sdbusRule::path("/xyz/openbmc_project/pldm") +
+            sdbusRule::interface("xyz.openbmc_project.PLDM.Event"),
+        std::bind(std::mem_fn(&SoftPowerOff::hostSoftOffComplete), this,
+                  std::placeholders::_1));
+}
+
+int SoftPowerOff::getHostState()
+{
+    try
+    {
+        pldm::utils::PropertyValue propertyValue =
+            pldm::utils::DBusHandler().getDbusPropertyVariant(
+                "/xyz/openbmc_project/state/host0", "CurrentHostState",
+                "xyz.openbmc_project.State.Host");
+
+        if (std::get<std::string>(propertyValue) !=
+            "xyz.openbmc_project.State.Host.HostState.Running")
+        {
+            // Host state is not "Running", this app should return success
+            completed = true;
+            return PLDM_SUCCESS;
+        }
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << "PLDM host soft off: Can't get current host state.\n";
+        hasError = true;
+        return PLDM_ERROR;
+    }
+
+    return PLDM_SUCCESS;
+}
+
+void SoftPowerOff::hostSoftOffComplete(sdbusplus::message::message& msg)
+{
+    pldm::pdr::TerminusID msgTID;
+    pldm::pdr::SensorID msgSensorID;
+    pldm::pdr::SensorOffset msgSensorOffset;
+    pldm::pdr::EventState msgEventState;
+    pldm::pdr::EventState msgPreviousEventState;
+
+    // Read the msg and populate each variable
+    msg.read(msgTID, msgSensorID, msgSensorOffset, msgEventState,
+             msgPreviousEventState);
+
+    if (msgSensorID == sensorID && msgSensorOffset == sensorOffset &&
+        msgEventState == PLDM_SW_TERM_GRACEFUL_SHUTDOWN)
+    {
+        // Receive Graceful shutdown completion event message. Disable the timer
+        auto rc = timer.stop();
+        if (rc < 0)
+        {
+            std::cerr << "PLDM soft off: Failure to STOP the timer. ERRNO="
+                      << rc << "\n";
+        }
+
+        // This marks the completion of pldm soft power off.
+        completed = true;
+    }
+}
+
+int SoftPowerOff::getEffecterID()
+{
+    auto& bus = pldm::utils::DBusHandler::getBus();
+
+    // VMM is a logical entity, so the bit 15 in entity type is set.
+    pdr::EntityType entityType = PLDM_ENTITY_VIRTUAL_MACHINE_MANAGER | 0x8000;
+
+    try
+    {
+        std::vector<std::vector<uint8_t>> VMMResponse{};
+        auto VMMMethod = bus.new_method_call(
+            "xyz.openbmc_project.PLDM", "/xyz/openbmc_project/pldm",
+            "xyz.openbmc_project.PLDM.PDR", "FindStateEffecterPDR");
+        VMMMethod.append(TID, entityType,
+                         (uint16_t)PLDM_STATE_SET_SW_TERMINATION_STATUS);
+
+        auto VMMResponseMsg = bus.call(VMMMethod);
+
+        VMMResponseMsg.read(VMMResponse);
+        if (VMMResponse.size() != 0)
+        {
+            for (auto& rep : VMMResponse)
+            {
+                auto VMMPdr =
+                    reinterpret_cast<pldm_state_effecter_pdr*>(rep.data());
+                effecterID = VMMPdr->effecter_id;
+            }
+        }
+        else
+        {
+            VMMPdrExist = false;
+        }
+    }
+    catch (const SdBusError& e)
+    {
+        std::cerr << "PLDM soft off: Error get VMM PDR,ERROR=" << e.what()
+                  << "\n";
+        VMMPdrExist = false;
+    }
+
+    if (VMMPdrExist)
+    {
+        return PLDM_SUCCESS;
+    }
+
+    // If the Virtual Machine Manager PDRs doesn't exist, go find the System
+    // Firmware PDRs.
+    // System Firmware is a logical entity, so the bit 15 in entity type is set
+    entityType = PLDM_ENTITY_SYS_FIRMWARE | 0x8000;
+    try
+    {
+        std::vector<std::vector<uint8_t>> sysFwResponse{};
+        auto sysFwMethod = bus.new_method_call(
+            "xyz.openbmc_project.PLDM", "/xyz/openbmc_project/pldm",
+            "xyz.openbmc_project.PLDM.PDR", "FindStateEffecterPDR");
+        sysFwMethod.append(TID, entityType,
+                           (uint16_t)PLDM_STATE_SET_SW_TERMINATION_STATUS);
+
+        auto sysFwResponseMsg = bus.call(sysFwMethod);
+
+        sysFwResponseMsg.read(sysFwResponse);
+
+        if (sysFwResponse.size() == 0)
+        {
+            std::cerr
+                << "No effecter ID has been found that matches the criteria"
+                << "\n";
+            return PLDM_ERROR;
+        }
+
+        for (auto& rep : sysFwResponse)
+        {
+            auto sysFwPdr =
+                reinterpret_cast<pldm_state_effecter_pdr*>(rep.data());
+            effecterID = sysFwPdr->effecter_id;
+        }
+    }
+    catch (const SdBusError& e)
+    {
+        std::cerr << "PLDM soft off: Error get system firmware PDR,ERROR="
+                  << e.what() << "\n";
+        return PLDM_ERROR;
+    }
+
+    return PLDM_SUCCESS;
+}
+
+int SoftPowerOff::getSensorInfo()
+{
+    pldm::pdr::EntityType entityType;
+
+    entityType = VMMPdrExist ? PLDM_ENTITY_VIRTUAL_MACHINE_MANAGER
+                             : PLDM_ENTITY_SYS_FIRMWARE;
+
+    // The Virtual machine manager/System firmware is logical entity, so bit 15
+    // need to be set.
+    entityType = entityType | 0x8000;
+
+    try
+    {
+        auto& bus = pldm::utils::DBusHandler::getBus();
+        std::vector<std::vector<uint8_t>> Response{};
+        auto method = bus.new_method_call(
+            "xyz.openbmc_project.PLDM", "/xyz/openbmc_project/pldm",
+            "xyz.openbmc_project.PLDM.PDR", "FindStateSensorPDR");
+        method.append(TID, entityType,
+                      (uint16_t)PLDM_STATE_SET_SW_TERMINATION_STATUS);
+
+        auto ResponseMsg = bus.call(method);
+
+        ResponseMsg.read(Response);
+
+        if (Response.size() == 0)
+        {
+            std::cerr
+                << "No sensor PDR has been found that matches the criteria"
+                << "\n";
+            return PLDM_ERROR;
+        }
+
+        pldm_state_sensor_pdr* pdr;
+        for (auto& rep : Response)
+        {
+            pdr = reinterpret_cast<pldm_state_sensor_pdr*>(rep.data());
+        }
+
+        sensorID = pdr->sensor_id;
+
+        auto compositeSensorCount = pdr->composite_sensor_count;
+        auto possibleStatesStart = pdr->possible_states;
+
+        for (auto offset = 0; offset < compositeSensorCount; offset++)
+        {
+            auto possibleStates =
+                reinterpret_cast<state_sensor_possible_states*>(
+                    possibleStatesStart);
+            auto setId = possibleStates->state_set_id;
+            auto possibleStateSize = possibleStates->possible_states_size;
+
+            if (setId == PLDM_STATE_SET_SW_TERMINATION_STATUS)
+            {
+                sensorOffset = offset;
+                break;
+            }
+            possibleStatesStart +=
+                possibleStateSize + sizeof(setId) + sizeof(possibleStateSize);
+        }
+    }
+    catch (const SdBusError& e)
+    {
+        std::cerr << "PLDM soft off: Error get State Sensor PDR,ERROR="
+                  << e.what() << "\n";
+        return PLDM_ERROR;
+    }
+
+    return PLDM_SUCCESS;
+}
+
+int SoftPowerOff::hostSoftOff(sdeventplus::Event& event)
+{
+    constexpr uint8_t effecterCount = 1;
+    uint8_t mctpEID;
+    uint8_t instanceID;
+
+    mctpEID = pldm::utils::readHostEID();
+
+    // Get instanceID
+    try
+    {
+        auto& bus = pldm::utils::DBusHandler::getBus();
+        auto method = bus.new_method_call(
+            "xyz.openbmc_project.PLDM", "/xyz/openbmc_project/pldm",
+            "xyz.openbmc_project.PLDM.Requester", "GetInstanceId");
+        method.append(mctpEID);
+
+        auto ResponseMsg = bus.call(method);
+
+        ResponseMsg.read(instanceID);
+    }
+    catch (const SdBusError& e)
+    {
+        std::cerr << "PLDM soft off: Error get instanceID,ERROR=" << e.what()
+                  << "\n";
+        return PLDM_ERROR;
+    }
+
+    std::array<uint8_t, sizeof(pldm_msg_hdr) + sizeof(effecterID) +
+                            sizeof(effecterCount) +
+                            sizeof(set_effecter_state_field)>
+        requestMsg{};
+    auto request = reinterpret_cast<pldm_msg*>(requestMsg.data());
+    set_effecter_state_field stateField{
+        PLDM_REQUEST_SET, PLDM_SW_TERM_GRACEFUL_SHUTDOWN_REQUESTED};
+    auto rc = encode_set_state_effecter_states_req(
+        instanceID, effecterID, effecterCount, &stateField, request);
+    if (rc != PLDM_SUCCESS)
+    {
+        std::cerr << "Message encode failure. PLDM error code = " << std::hex
+                  << std::showbase << rc << "\n";
+        return PLDM_ERROR;
+    }
+
+    // Open connection to MCTP socket
+    int fd = pldm_open();
+    if (-1 == fd)
+    {
+        std::cerr << "Failed to connect to mctp demux daemon"
+                  << "\n";
+        return PLDM_ERROR;
+    }
+
+    // Add a timer to the event loop, default 30s.
+    auto timerCallback = [=](Timer& /*source*/, Timer::TimePoint /*time*/) {
+        if (!responseReceived)
+        {
+            std::cerr << "PLDM soft off: ERROR! Can't get the response for the "
+                         "PLDM request msg. Time out!\n"
+                      << "Exit the pldm-softpoweroff\n";
+            exit(-1);
+        }
+        return;
+    };
+    Timer time(event, (Clock(event).now() + std::chrono::seconds{30}),
+               std::chrono::seconds{1}, std::move(timerCallback));
+
+    // Add a callback to handle EPOLLIN on fd
+    auto callback = [=](IO& io, int fd, uint32_t revents) {
+        if (!(revents & EPOLLIN))
+        {
+            return;
+        }
+
+        uint8_t* responseMsg = nullptr;
+        size_t responseMsgSize{};
+
+        auto rc = pldm_recv(mctpEID, fd, request->hdr.instance_id, &responseMsg,
+                            &responseMsgSize);
+        if (rc)
+        {
+            return;
+        }
+
+        std::unique_ptr<uint8_t, decltype(std::free)*> responseMsgPtr{
+            responseMsg, std::free};
+
+        // We've got the response meant for the PLDM request msg that was
+        // sent out
+        io.set_enabled(Enabled::Off);
+        auto response = reinterpret_cast<pldm_msg*>(responseMsgPtr.get());
+        std::cerr << "Getting the response. PLDM RC = " << std::hex
+                  << std::showbase
+                  << static_cast<uint16_t>(response->payload[0]) << "\n";
+
+        responseReceived = true;
+
+        // Start Timer
+        using namespace std::chrono;
+        auto timeMicroseconds =
+            duration_cast<microseconds>(seconds(SOFTOFF_TIMEOUT_SECONDS));
+
+        auto ret = startTimer(timeMicroseconds);
+        if (ret < 0)
+        {
+            std::cerr << "Failure to start Host soft off wait timer, ERRNO = "
+                      << ret << "Exit the pldm-softpoweroff\n";
+            exit(-1);
+        }
+        else
+        {
+            std::cerr << "Timer started waiting for host soft off, "
+                         "TIMEOUT_IN_SEC = "
+                      << SOFTOFF_TIMEOUT_SECONDS << "\n";
+        }
+        return;
+    };
+    IO io(event, fd, EPOLLIN, std::move(callback));
+
+    // Send PLDM Request message - pldm_send doesn't wait for response
+    rc = pldm_send(mctpEID, fd, requestMsg.data(), requestMsg.size());
+    if (0 > rc)
+    {
+        std::cerr << "Failed to send message/receive response. RC = " << rc
+                  << ", errno = " << errno << "\n";
+        return PLDM_ERROR;
+    }
+
+    // Time out or soft off complete
+    while (!isCompleted() && !isTimerExpired())
+    {
+        try
+        {
+            event.run(std::nullopt);
+        }
+        catch (const sdeventplus::SdEventError& e)
+        {
+            std::cerr
+                << "PLDM host soft off: Failure in processing request.ERROR= "
+                << e.what() << "\n";
+            return PLDM_ERROR;
+        }
+    }
+
+    return PLDM_SUCCESS;
+}
+
+int SoftPowerOff::startTimer(const std::chrono::microseconds& usec)
+{
+    return timer.start(usec);
+}
+} // namespace pldm
diff --git a/softoff/softoff.hpp b/softoff/softoff.hpp
new file mode 100644
index 0000000..302144c
--- /dev/null
+++ b/softoff/softoff.hpp
@@ -0,0 +1,148 @@
+#pragma once
+
+#include "libpldm/requester/pldm.h"
+
+#include "common/types.hpp"
+
+#include <sdbusplus/bus.hpp>
+#include <sdbusplus/server.hpp>
+#include <sdbusplus/server/object.hpp>
+#include <sdbusplus/timer.hpp>
+#include <sdeventplus/event.hpp>
+
+namespace pldm
+{
+
+/** @class SoftPowerOff
+ *  @brief Responsible for coordinating Host SoftPowerOff operation
+ */
+class SoftPowerOff
+{
+  public:
+    /** @brief Constructs SoftPowerOff object.
+     *
+     *  @param[in] bus       - system D-Bus handler
+     *  @param[in] event     - sd_event handler
+     */
+    SoftPowerOff(sdbusplus::bus::bus& bus, sd_event* event);
+
+    /** @brief Is the pldm-softpoweroff has error.
+     * if hasError is true, that means the pldm-softpoweroff failed to
+     * trigger the host soft off,so the pldm-softpoweroff will exit.
+     */
+    inline bool isError()
+    {
+        return hasError;
+    }
+
+    /** @brief Is the timer expired.
+     */
+    inline bool isTimerExpired()
+    {
+        return timer.isExpired();
+    }
+
+    /** @brief Is the host soft off completed.
+     */
+    inline bool isCompleted()
+    {
+        return completed;
+    }
+
+    /** @brief Is receive the response for the PLDM request msg.
+     */
+    inline bool isReceiveResponse()
+    {
+        return responseReceived;
+    }
+
+    /** @brief Send PLDM Set State Effecter States command and
+     * wait the host gracefully shutdown.
+     *
+     *  @param[in] event - The event loop.
+     *
+     *  @return PLDM_SUCCESS or PLDM_ERROR.
+     */
+    int hostSoftOff(sdeventplus::Event& event);
+
+  private:
+    /** @brief Getting the host current state.
+     */
+    int getHostState();
+
+    /** @brief Stop the timer.
+     */
+    inline auto stopTimer()
+    {
+        return timer.stop();
+    }
+
+    /** @brief When host soft off completed, stop the timer and
+     *         set the completed to true.
+     *
+     *  @param[in] msg - Data associated with subscribed signal
+     */
+    void hostSoftOffComplete(sdbusplus::message::message& msg);
+
+    /** @brief Start the timer.
+     *
+     *  @param[in] usec - Time to wait for the Host to gracefully shutdown.
+     *
+     *  @return Success or exception thrown
+     */
+    int startTimer(const std::chrono::microseconds& usec);
+
+    /** @brief Get effecterID from PDRs.
+     *
+     *  @return PLDM_SUCCESS or PLDM_ERROR
+     */
+    int getEffecterID();
+
+    /** @brief Get VMM/SystemFirmware Sensor info from PDRs.
+     *
+     *  @return PLDM_SUCCESS or PLDM_ERROR
+     */
+    int getSensorInfo();
+
+    /** @brief effecterID
+     */
+    uint16_t effecterID;
+
+    /** @brief sensorID.
+     */
+    pldm::pdr::SensorID sensorID;
+
+    /** @brief sensorOffset.
+     */
+    pldm::pdr::SensorOffset sensorOffset;
+
+    /** @brief Failed to send host soft off command flag.
+     */
+    bool hasError = false;
+
+    /** @brief Host soft off completed flag.
+     */
+    bool completed = false;
+
+    /** @brief The response for the PLDM request msg is received flag.
+     */
+    bool responseReceived = false;
+
+    /** @brief Is the Virtual Machine Manager/VMM state effecter available.
+     */
+    bool VMMPdrExist = true;
+
+    /* @brief sdbusplus handle */
+    sdbusplus::bus::bus& bus;
+
+    /** @brief Reference to Timer object */
+    phosphor::Timer timer;
+
+    /** @brief Used to subscribe to dbus pldm StateSensorEvent signal
+     * When the host soft off is complete, it sends an platform event message
+     * to BMC's pldmd, and the pldmd will emit the StateSensorEvent signal.
+     **/
+    std::unique_ptr<sdbusplus::bus::match_t> pldmEventSignal;
+};
+
+} // namespace pldm