forked from M-Labs/thermostat
280 lines
9.1 KiB
Python
280 lines
9.1 KiB
Python
import asyncio
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import json
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import logging
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class CommandError(Exception):
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pass
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class StoppedConnecting(Exception):
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pass
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class Client:
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def __init__(self):
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self._reader = None
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self._writer = None
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self._connecting_task = None
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self._command_lock = asyncio.Lock()
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self._report_mode_on = False
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self.timeout = None
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async def start_session(self, host='192.168.1.26', port=23, timeout=None):
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"""Start session to Thermostat at specified host and port.
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Throws StoppedConnecting if disconnect was called while connecting.
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Throws asyncio.TimeoutError if timeout was exceeded.
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Example::
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client = Client()
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try:
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await client.start_session()
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except StoppedConnecting:
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print("Stopped connecting")
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"""
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self._connecting_task = asyncio.create_task(
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asyncio.wait_for(asyncio.open_connection(host, port), timeout)
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)
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self.timeout = timeout
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try:
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self._reader, self._writer = await self._connecting_task
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except asyncio.CancelledError:
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raise StoppedConnecting
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finally:
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self._connecting_task = None
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await self._check_zero_limits()
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def connecting(self):
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"""Returns True if client is connecting"""
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return self._connecting_task is not None
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def connected(self):
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"""Returns True if client is connected"""
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return self._writer is not None
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async def end_session(self):
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"""End session to Thermostat if connected, cancel connection if connecting"""
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if self._connecting_task is not None:
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self._connecting_task.cancel()
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if self._writer is None:
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return
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# Reader needn't be closed
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self._writer.close()
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await self._writer.wait_closed()
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self._reader = None
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self._writer = None
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async def _check_zero_limits(self):
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pwm_report = await self.get_pwm()
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for pwm_channel in pwm_report:
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for limit in ["max_i_neg", "max_i_pos", "max_v"]:
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if pwm_channel[limit]["value"] == 0.0:
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logging.warning("`{}` limit is set to zero on channel {}".format(limit, pwm_channel["channel"]))
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async def _read_line(self):
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# read 1 line
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chunk = await asyncio.wait_for(self._reader.readline(), self.timeout) # Only wait for response until timeout
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return chunk.decode('utf-8', errors='ignore')
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async def _read_write(self, command):
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self._writer.write(((" ".join(command)).strip() + "\n").encode('utf-8'))
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await self._writer.drain()
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return await self._read_line()
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async def _command(self, *command):
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async with self._command_lock:
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# protect the read-write process from being cancelled midway
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line = await asyncio.shield(self._read_write(command))
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response = json.loads(line)
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logging.debug(f"{command}: {response}")
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if "error" in response:
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raise CommandError(response["error"])
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return response
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async def _get_conf(self, topic):
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result = [None, None]
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for item in await self._command(topic):
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result[int(item["channel"])] = item
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return result
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async def get_pwm(self):
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"""Retrieve PWM limits for the TEC
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Example::
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[{'channel': 0,
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'center': 'vref',
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'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
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'max_i_neg': {'max': 3.0, 'value': 3.0},
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'max_v': {'max': 5.988, 'value': 5.988},
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'max_i_pos': {'max': 3.0, 'value': 3.0}},
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{'channel': 1,
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'center': 'vref',
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'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
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'max_i_neg': {'max': 3.0, 'value': 3.0},
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'max_v': {'max': 5.988, 'value': 5.988},
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'max_i_pos': {'max': 3.0, 'value': 3.0}}
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]
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"""
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return await self._get_conf("pwm")
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async def get_pid(self):
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"""Retrieve PID control state
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Example::
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[{'channel': 0,
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'parameters': {
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'kp': 10.0,
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'ki': 0.02,
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'kd': 0.0,
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'output_min': 0.0,
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'output_max': 3.0},
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'target': 37.0},
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{'channel': 1,
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'parameters': {
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'kp': 10.0,
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'ki': 0.02,
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'kd': 0.0,
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'output_min': 0.0,
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'output_max': 3.0},
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'target': 36.5}]
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"""
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return await self._get_conf("pid")
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async def get_steinhart_hart(self):
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"""Retrieve Steinhart-Hart parameters for resistance to temperature conversion
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Example::
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[{'params': {'b': 3800.0, 'r0': 10000.0, 't0': 298.15}, 'channel': 0},
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{'params': {'b': 3800.0, 'r0': 10000.0, 't0': 298.15}, 'channel': 1}]
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"""
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return await self._get_conf("s-h")
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async def get_postfilter(self):
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"""Retrieve DAC postfilter configuration
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Example::
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[{'rate': None, 'channel': 0},
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{'rate': 21.25, 'channel': 1}]
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"""
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return await self._get_conf("postfilter")
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async def get_fan(self):
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"""Get Thermostat current fan settings"""
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return await self._command("fan")
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async def report(self):
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"""Obtain one-time report on measurement values"""
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return await self._command("report")
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async def report_mode(self):
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"""Start reporting measurement values
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Example of yielded data::
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{'channel': 0,
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'time': 2302524,
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'adc': 0.6199188965423515,
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'sens': 6138.519310282602,
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'temperature': 36.87032392655527,
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'pid_engaged': True,
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'i_set': 2.0635816680889123,
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'vref': 1.494,
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'dac_value': 2.527790834044456,
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'dac_feedback': 2.523,
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'i_tec': 2.331,
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'tec_i': 2.0925,
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'tec_u_meas': 2.5340000000000003,
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'pid_output': 2.067581958092247}
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"""
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await self._command("report mode", "on")
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self._report_mode_on = True
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while self._report_mode_on:
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async with self._command_lock:
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line = await self._read_line()
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if not line:
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break
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try:
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yield json.loads(line)
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except json.decoder.JSONDecodeError:
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pass
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await self._command("report mode", "off")
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def stop_report_mode(self):
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self._report_mode_on = False
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async def set_param(self, topic, channel, field="", value=""):
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"""Set configuration parameters
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Examples::
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await tec.set_param("pwm", 0, "max_v", 2.0)
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await tec.set_param("pid", 1, "output_max", 2.5)
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await tec.set_param("s-h", 0, "t0", 20.0)
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await tec.set_param("center", 0, "vref")
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await tec.set_param("postfilter", 1, 21)
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See the firmware's README.md for a full list.
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"""
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if type(value) is float:
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value = "{:f}".format(value)
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if type(value) is not str:
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value = str(value)
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await self._command(topic, str(channel), field, value)
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async def set_fan(self, power="auto"):
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"""Set fan power"""
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await self._command("fan", str(power))
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async def set_fcurve(self, a=1.0, b=0.0, c=0.0):
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"""Set fan curve"""
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await self._command("fcurve", str(a), str(b), str(c))
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async def power_up(self, channel, target):
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"""Start closed-loop mode"""
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await self.set_param("pid", channel, "target", value=target)
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await self.set_param("pwm", channel, "pid")
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async def save_config(self, channel=""):
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"""Save current configuration to EEPROM"""
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await self._command("save", str(channel))
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async def load_config(self, channel=""):
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"""Load current configuration from EEPROM"""
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await self._command("load", str(channel))
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if channel == "":
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await self._read_line() # Read the extra {}
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async def hw_rev(self):
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"""Get Thermostat hardware revision"""
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return await self._command("hwrev")
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async def reset(self):
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"""Reset the Thermostat
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The client is disconnected as the TCP session is terminated.
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"""
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async with self._command_lock:
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self._writer.write("reset\n".encode('utf-8'))
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await self._writer.drain()
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await self.end_session()
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async def dfu(self):
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"""Put the Thermostat in DFU update mode
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The client is disconnected as the Thermostat stops responding to
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TCP commands in DFU update mode. The only way to exit it is by
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power-cycling.
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"""
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async with self._command_lock:
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self._writer.write("dfu\n".encode('utf-8'))
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await self._writer.drain()
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await self.end_session()
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async def ipv4(self):
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"""Get the IPv4 settings of the Thermostat"""
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return await self._command('ipv4')
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