driver: kirdy driver rewrite

- Start a new thread to handle connections and schedule FIFO task execution
- Make all the cmd accessible without using async
- Connections automatically retry upon disconnection
- Add support for PyQt6 Signal

pykirdy/driver/kirdy.py

@@ -1,8 +1,11 @@
 import socket
-import asyncio
 import json
 import logging
+import time
+from threading import Thread
 from aenum import StrEnum, NoAlias
+import queue
+import asyncio
 
 class _dt(StrEnum):
     ip_settings = "ip_settings"
@@ -11,6 +14,10 @@ class _dt(StrEnum):
     bool = "data_bool"
     none = "None"
 
+class State(StrEnum):
+    disconnected = "disconnected"
+    connected = "connected"
+
 class CmdList:
     class device(StrEnum, settings=NoAlias):
         _target = "device_cmd"
@@ -152,14 +159,13 @@ class StoppedConnecting(Exception):
     pass
 
 class Device:
-    def __init__(self, send_cmd_handler, send_raw_cmd_handler, read_response, cmd_lock):
+    def __init__(self, send_cmd_handler, send_raw_cmd_handler, read_msg_queue):
         self._cmd = CmdList.device
         self._send_cmd = send_cmd_handler
         self._send_raw_cmd = send_raw_cmd_handler
-        self._read_response = read_response
-        self._cmd_lock = cmd_lock
+        self._read_msg_queue = read_msg_queue
 
-    async def set_ip_settings(self, addr="192.168.1.128", port=1337, prefix_len=24, gateway="192.168.1.1"):
+    def set_ip_settings(self, addr="192.168.1.128", port=1337, prefix_len=24, gateway="192.168.1.1"):
         """
             After calling this fn, the ip settings are immediately saved into flash and will be effective on next reboot.
         """
@@ -175,7 +181,7 @@ class Device:
         if not(isinstance(port, int) and isinstance(prefix_len, int)):
             raise InvalidDataType
         
-        return await self._send_raw_cmd(
+        return self._send_raw_cmd(
             {
                 "device_cmd": "SetIPSettings",
                 "ip_settings": {
@@ -187,28 +193,28 @@ class Device:
             }
         )
 
-    async def set_active_report_mode(self, on):
+    def set_active_report_mode(self, on):
         """
             Set active report to be on. If it is on, Kirdy will send status report
             to ALL client socket connections according to the temperature polling rate set.
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetActiveReportMode, on)
+        return self._send_cmd(self._cmd._target, self._cmd.SetActiveReportMode, on)
 
-    async def set_pd_mon_fin_gain(self, gain):
+    def set_pd_mon_fin_gain(self, gain):
         """
             Configure the photodiode monitor final analog front-end stage gain
                 - gain: unitless
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPdFinGain, gain)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPdFinGain, gain)
 
-    async def set_pd_mon_transconductance(self, transconductance):
+    def set_pd_mon_transconductance(self, transconductance):
         """
             Configure the photodiode monitor transconductance
                 - transconductance: 1/Ohm
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPdTransconductance, transconductance)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPdTransconductance, transconductance)
 
-    async def get_status_report(self):
+    def get_status_report(self, sig=None):
         """
             Get status of all peripherals in a json object
 
@@ -238,9 +244,13 @@ class Device:
                 }
             }
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.GetStatusReport, msg_type="Report")
+        if sig is None:
+            self._send_cmd(self._cmd._target, self._cmd.GetStatusReport, msg_type="Report", sig=sig)
+            return self._read_msg_queue()
+        else:
+            return self._send_cmd(self._cmd._target, self._cmd.GetStatusReport, msg_type="Report", sig=sig)
 
-    async def get_settings_summary(self):
+    def get_settings_summary(self, sig=None):
         """
             Get the current settings of laser and thermostat in a json object
 
@@ -308,153 +318,152 @@ class Device:
                 }
             }
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.GetSettingsSummary, msg_type="Settings")
+        if sig is None:
+            self._send_cmd(self._cmd._target, self._cmd.GetSettingsSummary, msg_type="Settings", sig=sig)
+            return self._read_msg_queue()
+        else:
+            return self._send_cmd(self._cmd._target, self._cmd.GetSettingsSummary, msg_type="Settings", sig=sig)
 
-    async def dfu(self):
+    def dfu(self):
         """
             Issuing this cmd will HARD RESET the device and 
             put Kirdy into Dfu mode for flashing firmware.
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.Dfu)
+        return self._send_cmd(self._cmd._target, self._cmd.Dfu, hard_reset=True)
 
-    async def save_current_settings_to_flash(self):
+    def save_current_settings_to_flash(self):
         """
             Save the current laser diode and thermostat configurations into flash.
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SaveFlashSettings)
+        return self._send_cmd(self._cmd._target, self._cmd.SaveFlashSettings)
 
-    async def restore_settings_from_flash(self):
+    def restore_settings_from_flash(self):
         """
             Restore the laser diode and thermostat settings from flash
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.LoadFlashSettings)
+        return self._send_cmd(self._cmd._target, self._cmd.LoadFlashSettings)
 
-    async def hard_reset(self):
+    def hard_reset(self):
         """
             Hard Reset Kirdy. The socket connection will be closed by Kirdy. 
             Laser diode power and Tec power will be turned off.
             Kirdy will send out a json({'msg_type': 'HardReset'}) to all sockets indicating. The device is being reset.
         """
-        response = await self._send_cmd(self._cmd._target, self._cmd.HardReset)
-        if response is not None:
-            if response["msg_type"] == "Acknowledge":
-                # Delay for a second to wait for the hard reset message being sent out on Kirdy
-                await asyncio.sleep(1.0)
-        return response 
+        return self._send_cmd(self._cmd._target, self._cmd.HardReset, hard_reset=True)
 
 class Laser:
-    def __init__(self, send_cmd_handler, cmd_lock):
+    def __init__(self, send_cmd_handler):
         self._cmd = CmdList.ld
         self._send_cmd = send_cmd_handler
-        self._cmd_lock = cmd_lock
 
-    async def set_power_on(self, on):
+    def set_power_on(self, on):
         """
             Power Up or Power Down laser diode. Powering up the Laser Diode resets the pwr_excursion status
                 - on (True/False)
         """
         if on:
-            return await self._send_cmd(self._cmd._target, self._cmd.PowerUp, None)
+            return self._send_cmd(self._cmd._target, self._cmd.PowerUp, None)
         else:
-            return await self._send_cmd(self._cmd._target, self._cmd.PowerDown, None)
+            return self._send_cmd(self._cmd._target, self._cmd.PowerDown, None)
 
-    async def set_default_pwr_on(self, on):
+    def set_default_pwr_on(self, on):
         """
             Set whether laser diode is powered up at Startup
                 - on (True/False)
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetDefaultPowerOn, on)
+        return self._send_cmd(self._cmd._target, self._cmd.SetDefaultPowerOn, on)
     
-    async def set_ld_terms_short(self, short):
+    def set_ld_terms_short(self, short):
         """
             Open/Short laser diode terminals.
                 - on (True/False)
         """
         if short:
-            return await self._send_cmd(self._cmd._target, self._cmd.LdTermsShort, None)
+            return self._send_cmd(self._cmd._target, self._cmd.LdTermsShort, None)
         else:
-            return await self._send_cmd(self._cmd._target, self._cmd.LdTermsOpen, None)
+            return self._send_cmd(self._cmd._target, self._cmd.LdTermsOpen, None)
 
-    async def set_i(self, i):
+    def set_i(self, i):
         """
             Set laser diode output current: Max(0, Min(i_set, i_soft_limit))
                 - i: A  
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetI, i)
+        return self._send_cmd(self._cmd._target, self._cmd.SetI, i)
     
-    async def set_pd_mon_responsitivity(self, responsitivity):
+    def set_pd_mon_responsitivity(self, responsitivity):
         """
             Configure the photodiode monitor responsitivity parameter
                 - responsitivity: A/W
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPdResponsitivity, responsitivity)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPdResponsitivity, responsitivity)
 
-    async def set_pd_mon_dark_current(self, dark_current):
+    def set_pd_mon_dark_current(self, dark_current):
         """
-            Configure the photodiode monitor responsitivity parameter
-                - dark_current: A/W
+            Configure the photodiode monitor dark current parameter
+                - dark_current: A
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPdDarkCurrent, dark_current)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPdDarkCurrent, dark_current)
 
-    async def set_ld_pwr_limit(self, pwr_limit):
+    def set_ld_pwr_limit(self, pwr_limit):
         """
             Set power limit for the power excursion monitor
             If the calculated power with the params of pd_mon > pwr_limit,
             overpower protection is triggered.
                 - pwr_limit: W 
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetLdPwrLimit, pwr_limit)
+        return self._send_cmd(self._cmd._target, self._cmd.SetLdPwrLimit, pwr_limit)
 
-    async def clear_alarm(self):
+    def clear_alarm(self):
         """
             Clear the power excursion monitor alarm 
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.ClearAlarm)
+        return self._send_cmd(self._cmd._target, self._cmd.ClearAlarm)
 
 class Thermostat:
-    def __init__(self, send_cmd_handler, send_raw_cmd_handler, cmd_lock):
+    def __init__(self, send_cmd_handler, send_raw_cmd_handler):
         self._cmd = CmdList.thermostat
         self._send_cmd = send_cmd_handler
         self._send_raw_cmd = send_raw_cmd_handler
-        self._cmd_lock = cmd_lock
-    async def set_power_on(self, on):
+
+    def set_power_on(self, on):
         """
             Power up or power down thermostat
                 - Powering up the thermostat resets the pwr_excursion status
         """
         if on:
-            return await self._send_cmd(self._cmd._target, self._cmd.PowerUp, None)
+            return self._send_cmd(self._cmd._target, self._cmd.PowerUp, None)
         else:
-            return await self._send_cmd(self._cmd._target, self._cmd.PowerDown, None)
+            return self._send_cmd(self._cmd._target, self._cmd.PowerDown, None)
 
-    async def set_default_pwr_on(self, on):
+    def set_default_pwr_on(self, on):
         """
             Set whether thermostat is powered up at Startup
+                - on: (True/False)
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetDefaultPowerOn, on)
+        return self._send_cmd(self._cmd._target, self._cmd.SetDefaultPowerOn, on)
 
-    async def set_tec_max_v(self, max_v):
+    def set_tec_max_v(self, max_v):
         """
             Set Tec Maximum Voltage Across the TEC Terminals
                 - max_v: V
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTecMaxV, max_v)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTecMaxV, max_v)
 
-    async def set_tec_max_cooling_i(self, max_i_pos):
+    def set_tec_max_cooling_i(self, max_i_pos):
         """
             Set Tec maximum cooling current (Settable Range: 0.0 - 1.0)
                 - max_i_pos: A
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTecMaxIPos, max_i_pos)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTecMaxIPos, max_i_pos)
 
-    async def set_tec_max_heating_i(self, max_i_neg):
+    def set_tec_max_heating_i(self, max_i_neg):
         """
             Set Tec maximum heating current (Settable Range: 0.0 - 1.0)
                 - max_i_neg: A
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTecMaxINeg, max_i_neg)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTecMaxINeg, max_i_neg)
 
-    async def set_tec_i_out(self, i_out):
+    def set_tec_i_out(self, i_out):
         """
             Set Tec Output Current
             This cmd is only effective in constant current control mode 
@@ -462,112 +471,112 @@ class Thermostat:
                 - i_out: A
         """
         if isinstance(i_out, float):
-            return await self._send_raw_cmd({"tec_set_i": i_out})
+            return self._send_raw_cmd({"tec_set_i": i_out})
         elif isinstance(i_out, int):
-            return await self._send_raw_cmd({"tec_set_i": float(i_out)})
+            return self._send_raw_cmd({"tec_set_i": float(i_out)})
         else:
             raise InvalidDataType
 
-    async def set_constant_current_control_mode(self):
+    def set_constant_current_control_mode(self):
         """
             Disable PID Controller and output current can be controlled with set_tec_i_out() cmd.
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidDisEngage, None)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidDisEngage, None)
 
-    async def set_temperature_setpoint(self, temperature):
+    def set_temperature_setpoint(self, temperature):
         """
             Set Temperature Setpoint for PID Controller. This parameter is not active in constant current control mode
                 - temperature: Degree Celsius
         """
 
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTemperatureSetpoint, temperature)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTemperatureSetpoint, temperature)
 
-    async def set_pid_control_mode(self):
+    def set_pid_control_mode(self):
         """
             Enable PID Controller. Its PID Update Interval is controlled by the Temperature ADC polling rate.
             Please refer to config_temp_adc_filter for the possible polling rate options
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidEngage, None)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidEngage, None)
 
-    async def set_pid_kp(self, kp):
+    def set_pid_kp(self, kp):
         """
             Set Kp parameter for PID Controller
                 kp: (unitless) 
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidKp, kp)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidKp, kp)
 
-    async def set_pid_ki(self, ki):
+    def set_pid_ki(self, ki):
         """
             Set Ki parameter for PID Controller
                 ki: (unitless) 
         """
-        await self._send_cmd(self._cmd._target, self._cmd.SetPidKi, ki)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidKi, ki)
 
-    async def set_pid_kd(self, kd):
+    def set_pid_kd(self, kd):
         """
             Set Kd parameter for PID Controller
                 kd: (unitless) 
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidKd, kd)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidKd, kd)
 
-    async def set_pid_output_max(self, out_max):
+    def set_pid_output_max(self, out_max):
         """
             Set max output limit at the PID Output
                 - out_max: A
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidOutMax, out_max)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidOutMax, out_max)
     
-    async def set_pid_output_min(self, out_min):
+    def set_pid_output_min(self, out_min):
         """
             Set min output limit at the PID Output
                 - out_min: A
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetPidOutMin, out_min)
+        return self._send_cmd(self._cmd._target, self._cmd.SetPidOutMin, out_min)
     
-    async def set_temp_mon_upper_limit(self, upper_limit):
+    def set_temp_mon_upper_limit(self, upper_limit):
         """
             Set Temperature Monitor Upper Limit Threshold. Exceeding the limit for too long
             will force the TEC Controller, PID Controller and Laser Diode Power to Shutdown
                 - upper_limit: Degree Celsius
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTempMonUpperLimit, upper_limit)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTempMonUpperLimit, upper_limit)
 
-    async def set_temp_mon_lower_limit(self, lower_limit):
+    def set_temp_mon_lower_limit(self, lower_limit):
         """
             Set Temperature Monitor Lower Limit Threshold. Exceeding the limit for too long
             will force the TEC Controller, PID Controller and Laser Diode Power to Shutdown
                 - lower_limit: Degree Celsius
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetTempMonLowerLimit, lower_limit)
+        return self._send_cmd(self._cmd._target, self._cmd.SetTempMonLowerLimit, lower_limit)
 
-    async def clear_alarm(self):
+    def clear_alarm(self):
         """
             Clear the temperature monitor alarm
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.ClearAlarm)
+        return self._send_cmd(self._cmd._target, self._cmd.ClearAlarm)
 
-    async def set_sh_t0(self, t0):
+    def set_sh_t0(self, t0):
         """
             Set t0 Steinhart-Hart parameter for the laser diode NTC 
                 - t0: Degree Celsius
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetShT0, t0)
+        return self._send_cmd(self._cmd._target, self._cmd.SetShT0, t0)
 
-    async def set_sh_r0(self, r0):
+    def set_sh_r0(self, r0):
         """
             Set r0 Steinhart-Hart parameter for the laser diode NTC
                 - r0: Ohm
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetShR0, r0)
+        return self._send_cmd(self._cmd._target, self._cmd.SetShR0, r0)
 
-    async def set_sh_beta(self, beta):
+    def set_sh_beta(self, beta):
         """
             Set beta Steinhart-Hart parameter for the laser diode NTC 
                 - beta: (unitless)
         """
-        return await self._send_cmd(self._cmd._target, self._cmd.SetShBeta, beta)
+        return self._send_cmd(self._cmd._target, self._cmd.SetShBeta, beta)
     
-    async def config_temp_adc_filter(self, filter_config):
+    def config_temp_adc_filter(self, filter_config):
         """
             Configure the temperature adc filter type and sampling rate. 
             Please refer to AD7172 datasheet for the usage of various types of filter.
@@ -588,123 +597,298 @@ class Thermostat:
                 filter_config._odr_type(): filter_config,
             }
 
-        return await self._send_raw_cmd(cmd)
+        return self._send_raw_cmd(cmd)
 
 class Kirdy:
     def __init__(self):
-        self._reader = None
-        self._writer = None
-        self._connecting_task = None
-        self._cmd_lock = asyncio.Lock()
+        self.device = Device(self._send_cmd_handler, self._send_raw_cmd_handler, self._get_msg)
+        self.laser = Laser(self._send_cmd_handler)
+        self.thermostat = Thermostat(self._send_cmd_handler, self._send_raw_cmd_handler)
+
+        self._task_queue, self._msg_queue, self._int_msg_queue, self._report_queue = None, None, None, None
+        self._writer, self._reader = None, None
+        self._event_loop = None
+        
+        self._lock = asyncio.Lock()
+        self._msg_queue_get_report = False
         self._report_mode_on = False
-        self.timeout = None
-        self.device = Device(self._send_cmd_handler, self._send_raw_cmd_handler, self._read_response, self._cmd_lock)
-        self.laser = Laser(self._send_cmd_handler, self._cmd_lock)
-        self.thermostat = Thermostat(self._send_cmd_handler, self._send_raw_cmd_handler, self._cmd_lock)
 
-    async def start_session(self, host='192.168.1.128', port=1337, timeout=None):
-        self._connecting_task = asyncio.create_task(
-            asyncio.wait_for(asyncio.open_connection(host, port), timeout)
-        )
-        self.timeout = timeout
-        try:
-            self._reader, self._writer = await self._connecting_task
-            writer_sock = self._writer.get_extra_info("socket")
-            writer_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+        # PyQt Signal
+        self._report_sig = None # Dict
+        self._connected_sig = None # Bool
 
-        except asyncio.CancelledError:
-            raise StoppedConnecting
-        finally:
-            self._connecting_task = None
+    def set_report_sig(self, sig):
+        """
+            Connect a PyQt Signal to the active report output(dict)
+        """
+        self._report_sig = sig
+
+    def set_connected_sig(self, sig):
+        """
+            Connect a PyQt Signal to connection status(bool)
+                - True: Connection is established
+                - False: Connection is dropped
+        """
+        self._connected_sig = sig
+
+    def start_session(self, host='192.168.1.128', port=1337, timeout=5.0, con_retry=5.0):
+        """
+            Start Kirdy Connection Session. 
+            A new thread is started to handle TCP connection and task execution in the background.
+            In case of disconnection, all the queued tasks are cleared and the thread retries TCP connection indefinitely.
+            
+                - host: Kirdy's IP Address
+                - port: Kirdy's TCP Port
+        """
+        if self._event_loop is None:
+            self._host, self._ctrl_port = host, port
+            self._timeout, self._con_retry = timeout, con_retry
+
+            self._event_loop = asyncio.new_event_loop()
+            self._thread = Thread(target=self._event_loop.run_forever)
+            self._thread.start()
+            asyncio.run_coroutine_threadsafe(self._handler(), self._event_loop)
+            return True
+        else:
+            logging.warning("Helper Thread has been started.")
+            return False
+    
+    def end_session(self, block=False):
+        """
+            Stop Kirdy's TCP connection and its associated thread.
+        """
+        if self._event_loop is not None:
+            if block:
+                while not(self._task_queue.empty()):
+                    pass
+            cancel_task = asyncio.run_coroutine_threadsafe(self._stop_handler(), self._event_loop)
+            while not(cancel_task.done()):
+                pass
+            self._thread.join()
+            self._writer = None
+
+            if self._connected_sig is not None:
+                self._connected_sig.emit(False)
 
     def connecting(self):
-        """Returns True if client is connecting"""
-        return self._connecting_task is not None
+        """
+            Return True if client is connecting
+        """
+        return not self.connected() and self._event_loop is not None
 
     def connected(self):
-        """Returns True if client is connected"""
+        """
+            Returns True if client is connected.
+        """
         return self._writer is not None
 
-    async def end_session(self):
-        """End session to Kirdy if connected, cancel connection if connecting"""
-        if self._connecting_task is not None:
-            self._connecting_task.cancel()
+    def get_report_stream(self):
+        """
+            Start reporting device status in json object.
+        """
+        if self.connected():            
+            self._report_mode_on = True
 
-        if self._writer is None:
-            return
+            self.device.set_active_report_mode(True)
 
+            while self._report_mode_on:
+                report = self._report_queue.get()
+                if isinstance(report, Exception):
+                    raise report
+                yield report
+
+            self.device.set_active_report_mode(False)
+        else:
+            raise ConnectionError
+
+    def stop_report_mode(self):
+        self._report_mode_on = False
+
+    async def _sock_disconnection_handling(self):
         # Reader needn't be closed
-        self._writer.close()
         try:
+            self._writer.close()
             await self._writer.wait_closed()
-        except ConnectionResetError:
+        except:
             # In Hard Reset/DFU cmd, Kirdy may close its socket first
             pass
         self._reader = None
         self._writer = None
 
-    async def _read_response(self, buffer_size=16384, report=False):
-        """
-            Decode newline delimited Json objects and return the latest json received inside the buffer.
-                - buffer_size: Integer
-        """
-        try: 
-            raw_response = await asyncio.wait_for(self._reader.read(buffer_size), self.timeout)
+        for i in range(self._msg_queue.maxsize):
+            if self._msg_queue.full():
+                self._msg_queue.get_nowait()
+            self._msg_queue.put_nowait(None)
 
-            response = raw_response.decode('utf-8', errors='ignore').split("\n")
-            items = []
-            for item in reversed(response):
+        for i in range(self._report_queue.maxsize):
+            if self._report_queue.full():
+                self._report_queue.get_nowait()
+            self._report_queue.put_nowait(None)
+
+        if self._connected_sig is not None:
+            self._connected_sig.emit(False)
+
+    async def _handler(self):
         try:
-                    items.append(json.loads(item))
-                except json.decoder.JSONDecodeError as e:
-                    pass
-            if len(items) > 0 :
-                if report:
-                    return items[0]
+            state = State.disconnected
+            first_con = True
+            task = None
+            while True:
+                if state == State.disconnected:
+                    try:
+                        await self.__coninit(self._timeout)
+                        read_response_fut = asyncio.run_coroutine_threadsafe(self._read_response_handler(), self._event_loop)
+                        task = None
+                        logging.debug("Connected")
+
+                        # State Transition
+                        state = State.connected
+                    except (OSError, TimeoutError):
+                        if first_con:
+                            first_con = False
+                            logging.warning("Cannot connect to %s:%d. Retrying in the background", self._host, self._ctrl_port)
+                        await asyncio.sleep(self._con_retry)
+
+                elif state == State.connected:
+                    try:
+                        task = await self._task_queue.get()
+                        if isinstance(task, Exception):
+                            raise task
+                        
+                        response = await asyncio.wait_for(task(), self._timeout) 
+                        if response is not None:
+                            if response["msg_type"] != "Acknowledge":
+                                self._msg_queue.put_nowait(response)
+
+                    except (TimeoutError, ConnectionResetError):
+                        logging.warning("Kirdy connection is dropped.")
+                        first_con = True
+                        read_response_fut.cancel()
+                        await self._sock_disconnection_handling()
+                        
+                        # State Transition
+                        state = State.disconnected
+
+        except asyncio.exceptions.CancelledError:
+            logging.debug("Handler is canceling")
+        except:
+            logging.debug("Handler experienced an error. Exiting.", exc_info=True)
+        await self._sock_disconnection_handling()
+        if self._event_loop is not None:
+            self._event_loop.call_soon_threadsafe(self._event_loop.stop)
+            self._event_loop = None
+
+    async def _read_response_handler(self):
+        try:
+            while True:
+                if self._report_mode_on:
+                    responses = await asyncio.wait_for(self._read_response(), 5.0)
                 else:
-                    return items
+                    responses = await self._read_response()
+                for response in responses:
+                    if response["msg_type"] == 'Report' and not self._msg_queue_get_report:
+                        if self._report_sig is None:
+                            if self._report_queue.full():
+                                self._report_queue.get_nowait()
+                            self._report_queue.put_nowait(response)
                         else:
-                return { "msg_type": "EmptyResponse"}
+                            self._report_sig.emit(response)
+                    else:
+                        if self._msg_queue_get_report:
+                            async with self._lock:
+                                self._msg_queue_get_report = False
+                        if self._int_msg_queue.full():
+                            logging.debug("_int_msg_queue is full")
+                            self._int_msg_queue.get_nowait()
+                        self._int_msg_queue.put_nowait(response)
+        except asyncio.exceptions.CancelledError:
+            logging.debug("Read Response Handler is canceling")
         except TimeoutError:
-            return { "msg_type": "RecvTimeout"}
+            logging.warning("Read active report response timeout")
+            if self._task_queue.full():
+                logging.debug("_int_msg_queue is full")
+                self._task_queue.get_nowait()
+            self._task_queue.put_nowait(TimeoutError())
+        except ConnectionResetError:
+            logging.warning("Connection Reset by peer")
+            if self._task_queue.full():
+                logging.debug("_int_msg_queue is full")
+                self._task_queue.get_nowait()
+            self._task_queue.put_nowait(ConnectionResetError())
+        except:
+            logging.warn("Read Response Handler experienced an error. Exiting.", exc_info=True)
         
-    async def _send_raw_cmd_handler(self, cmd, lock=True, msg_type="Acknowledge"):
-        if lock:
-            async with self._cmd_lock:
-                return await asyncio.shield(self._send_raw_cmd(cmd, msg_type))
+        if self._report_mode_on:
+            self._report_mode_on = False
+            self._report_queue.put_nowait(TimeoutError)
+
+    async def _stop_handler(self):
+        for task in asyncio.all_tasks():
+            task.cancel()
+        await asyncio.gather(*asyncio.all_tasks(), loop=self._event_loop)
+
+    async def __coninit(self, timeout):
+        self._task_queue = asyncio.Queue(maxsize=64)
+        self._int_msg_queue = asyncio.Queue(maxsize=4)
+        self._msg_queue = queue.Queue(maxsize=64)
+        self._report_queue = queue.Queue(maxsize=16)
+
+        self._reader, self._writer = await asyncio.wait_for(asyncio.open_connection(self._host, self._ctrl_port), timeout)
+        writer_sock = self._writer.get_extra_info("socket")
+        writer_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+
+        if self._connected_sig is not None:
+            self._connected_sig.emit(True)
+        
+    async def _read_response(self, buffer_size=16384):
+        raw_response = await self._reader.read(buffer_size)
+        response = raw_response.decode('utf-8', errors='ignore').split("\n")
+        response.reverse()
+        items = []
+        for item in response[1:]:
+            items.append(json.loads(item))
+        return items
+
+    def _get_msg(self):
+        msg = self._msg_queue.get()
+        return msg
+
+    def _send_raw_cmd_handler(self, cmd, msg_type="Acknowledge", sig=None):
+        if self.connected():
+            self._event_loop.call_soon_threadsafe(self._task_queue.put_nowait, lambda: self._send_raw_cmd(cmd, msg_type, sig=sig))
         else:
-            return await asyncio.shield(self._send_raw_cmd(cmd, msg_type))
+            raise ConnectionError
     
     # If the cmd involves a cmd specific data type, 
     #   checking is done separately within the functions being called
-    async def _send_raw_cmd(self, cmd, msg_type):
-        retry = 0
-        while retry < 10:
-            try:
+    async def _send_raw_cmd(self, cmd, msg_type, sig=None):
+        if self.connected():
             self._writer.write(bytes(json.dumps(cmd), "UTF-8"))
             await self._writer.drain()
-                responses = await self._read_response()
-                for response in responses:
+            response = await self._int_msg_queue.get()
             if response["msg_type"] == msg_type:
+                if sig is not None:
+                    sig.emit(response)
+                    return {"msg_type": "Acknowledge"}
                 return response
-                    if response["msg_type"] == "InvalidCmd":
-                        raise InvalidCmd
-            except asyncio.exceptions.CancelledError:
-                return None
-            except Exception as e:
-                retry += 1
-                logging.error(f"_send_raw_cmd Exception: {e}")
-                await asyncio.sleep(0.1)
-        raise NoAckRecv
-
-    async def _send_cmd_handler(self, target, cmd, data=None, msg_type="Acknowledge", lock=True):
-        if lock:
-            async with self._cmd_lock:
-                return await asyncio.shield(self._send_cmd(target, cmd, data, msg_type))
             else:
-            return await asyncio.shield(self._send_cmd(target, cmd, data, msg_type))
+                raise InvalidCmd
+        else:
+            raise ConnectionError
 
-    async def _send_cmd(self, target, cmd, data, msg_type):
+    def _send_cmd_handler(self, target, cmd, data=None, msg_type="Acknowledge", sig=None, hard_reset=False):
+        if self.connected():
+            if hard_reset:
+                while not(self._task_queue.empty()):
+                    pass
+            self._event_loop.call_soon_threadsafe(self._task_queue.put_nowait, lambda: self._send_cmd(target, cmd, data, msg_type, sig=sig))
+            if hard_reset:
+                # Wait 1s for Kirdy to hard reset
+                time.sleep(1.0)
+        else:
+            raise ConnectionError
+
+    async def _send_cmd(self, target, cmd, data, msg_type, sig=None):
         cmd_dict = {}
         cmd_dict[target] = cmd.name
 
@@ -721,38 +905,18 @@ class Kirdy:
         elif cmd == "None":
             pass
 
-        retry = 0
-        while retry < 10:
-            try:
+        if msg_type == 'Report':
+            async with self._lock:
+                self._msg_queue_get_report = True
+
         self._writer.write(bytes(json.dumps(cmd_dict), "UTF-8"))
         await self._writer.drain()
-                responses = await self._read_response()
-                for response in responses:
-                    if response["msg_type"] == msg_type:
-                        return response
-                retry += 1
 
-                await asyncio.sleep(0.1)
-            except asyncio.exceptions.CancelledError:
-                return None
-        raise NoAckRecv
-
-    async def report_mode(self, report_interval = 0.0, buffer_size=16384):
-        """
-            Start reporting device status in json object. Optional report_interval can be added to discard unwanted samples.
-            Only the latest status report received within the buffer is returned. 
-                - polling interval: float/int (unit: seconds)
-                - buffer_size: int
-        """
-        await self.device.set_active_report_mode(True)
-        self._report_mode_on = True
-
-        while self._report_mode_on:
-            await asyncio.sleep(report_interval)
-            async with self._cmd_lock:
-                yield await self._read_response(buffer_size, report=True)
-
-        await self.device.set_active_report_mode(False)
-
-    def stop_report_mode(self):
-        self._report_mode_on = False
+        msg = await self._int_msg_queue.get()
+        if msg['msg_type'] == msg_type:
+            if sig is not None:
+                sig.emit(msg)
+                return {"msg_type": "Acknowledge"}
+            return msg
+        else:
+            raise InvalidCmd