[我知道这个话题已经被讨论过几次了，但是我已经尝试过，或者至少尝试了几乎所有的解决方案，但是作为一个相当新的python basher，我无法使用任何先前的解决方案。
该脚本的基本前提是，该脚本订阅了MQTT代理并等待命令，单个操作命令的工作效率为100％，但是其中一个命令需要无限期地循环运行，直到收到另一个命令为止，因此最合适解决方案是在单独的线程中运行“循环”，同时主订户循环继续“监听”下一条命令。
一切正常，运行95％，执行“静态”命令，任务运行正常，然后当执行“ mtg”命令时，它将操作线程，并且循环运行100％，但这是失败的地方，当接收到下一个命令时，我可以确认“ if”语句正在处理该命令，因为它将消息打印到控制台，但是thread.stop（）未运行，或者它可能已运行，但并未终止线程- -我正在拔头发，试图弄清楚。
某些代码：
from sys import exit
import blinkt
import threading
import time
MQTT_SERVER = '192.168.x.x'
MQTT_PORT = 1883
MQTT_TOPIC = 'mytopic'
REDS = [0, 0, 0, 0, 0, 16, 64, 255, 64, 16, 0, 0, 0, 0, 0, 0]
start_time = time.time()
class task(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.kill = threading.Event()
self.event = threading.Event()
self._stop = threading.Event()
def run(self):
# while not self.kill.is_set():
while True:
if self.stopped():
return
self.start_run()
def stop(self):
# self.event.set()
self._stop.set()
def stopped(self):
return self._stop.isSet()
def start_run(self):
# while True: <-- no longer needed as the run method loops the process.
delta = (time.time() - start_time) * 16
offset = int(abs((delta % len(REDS)) - blinkt.NUM_PIXELS))
for i in range(blinkt.NUM_PIXELS):
blinkt.set_pixel(i, REDS[offset + i], 0, 0)
blinkt.show()
time.sleep(0.1)
def on_connect(client, userdata, flags, rc):
print('Connected with result code ' + str(rc))
client.subscribe(MQTT_TOPIC)
def on_message(client, userdata, msg):
data = msg.payload
if type(data) is bytes:
data = data.decode('utf-8')
data = data.split(',')
command = data.pop(0)
if command == 'clr' and len(data) == 0:
blinkt.clear()
blinkt.show()
t1.stop() #<--- I've tried a few ways to get the task to stop when the "clr" command is recieved
task.stop()
return
if command == 'rgb' and len(data) == 4: #<-- This code block works fine, msg arrives and LEDs are set correctly
try:
pixel = data.pop(0)
if pixel == '*':
pixel = None
else:
pixel = int(pixel)
if pixel > 7:
print('Pixel out of range: ' + str(pixel))
return
r, g, b = [int(x) & 0xff for x in data]
print(command, pixel, r, g, b)
except ValueError:
print('Malformed command: ' + str(msg.payload))
return
if pixel is None:
for x in range(blinkt.NUM_PIXELS):
blinkt.set_pixel(x, r, g, b)
else:
blinkt.set_pixel(pixel, r, g, b)
blinkt.show()
return
if command == 'mtg' and len(data) == 0:
print(command)
t1 = task()
t1.start() #<-- Here is where the Thread is called to start and seems to run ok
return
blinkt.set_clear_on_exit()
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect(MQTT_SERVER, MQTT_PORT, 60)
client.loop_forever()
您的t1变量是局部变量，因此在退出on_message函数时它会丢失。另外，您正在将类task和实例t1（task.stop()不起作用）进行混合。
为了快速解决，将t1 = None声明为全局变量，然后将global t1添加到on_message函数中...
但是，我会考虑进行重构，因此有一个始终运行的线程来命令Blinkt !，并且MQTT消息处理程序只是相应地设置其状态-诸如此类。显然，使用干式编码，因此可能有些愚蠢。
from sys import exit
import blinkt
import threading
import time
MQTT_SERVER = "192.168.x.x"
MQTT_PORT = 1883
MQTT_TOPIC = "mytopic"
REDS = [0, 0, 0, 0, 0, 16, 64, 255, 64, 16, 0, 0, 0, 0, 0, 0]
start_time = time.time()
class BlinktManager(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.stop_event = threading.Event()
self.mode = None
def run(self):
while not self.stop_event.isSet():
self.tick()
self.stop_event.wait(0.1) # instead of sleep
def tick(self):
if self.mode == "reds":
self._tick_reds()
def _tick_reds(self):
delta = (time.time() - start_time) * 16
offset = int(
abs((delta % len(REDS)) - blinkt.NUM_PIXELS)
)
for i in range(blinkt.NUM_PIXELS):
blinkt.set_pixel(i, REDS[offset + i], 0, 0)
blinkt.show()
def clear(self):
self.mode = None
blinkt.clear()
blinkt.show()
def set_all_pixels(self, r, g, b):
self.mode = None
for x in range(blinkt.NUM_PIXELS):
blinkt.set_pixel(x, r, g, b)
blinkt.show()
def set_pixel(self, x, r, g, b):
self.mode = None
blinkt.set_pixel(x, r, g, b)
blinkt.show()
def begin_reds(self):
self.mode = "reds"
def on_connect(client, userdata, flags, rc):
print("Connected with result code " + str(rc))
client.subscribe(MQTT_TOPIC)
def on_message(client, userdata, msg):
data = msg.payload
if type(data) is bytes:
data = data.decode("utf-8")
data = data.split(",")
command = data.pop(0)
if command == "clr" and len(data) == 0:
blinkt_manager.clear()
if command == "rgb" and len(data) == 4:
x = data[0]
r, g, b = [int(x) & 0xFF for x in data[1:]]
if x == "*":
blinkt_manager.set_all_pixels(r, g, b)
else:
# TODO: error handling
blinkt_manager.set_pixel(int(x), r, g, b)
if command == "mtg" and len(data) == 0:
blinkt_manager.begin_reds()
blinkt.set_clear_on_exit()
blinkt_manager = BlinktManager()
blinkt_manager.start()
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect(MQTT_SERVER, MQTT_PORT, 60)
client.loop_forever()