我将Rpi3和CoApthon用于IOT项目,并且试图在exampleresources文件中添加温度读数输出作为资源。但是,当我运行服务器时,我得到一个错误,即有效载荷为空,并且在不允许任何有效载荷的情况下为函数赋予了参数。有人可以告诉我我在做什么错吗?
import time
from coapthon.resources.resource import Resources
import threading
import atexit
import glob
import os
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
devices_folder = glob.glob(base_dir+'28*')[0]
device_file = device_folder + '/w1_slave'
class TempResource(Resource):
def __init__(self,name="TempResource",coap_server=None):
super(TempResource,self).__init__(name,coap_server,visible=True,observable=True,allow_children=True)
self.payload = "This is the Current Temperature"
self.resource_type = "rt1"
self.content_type = "text/plain"
self.interface_type = "if1"
self.var = 0
def read_temp_raw():
f = open(device_file,'r')
lines = f.readlines()
f.close()
return lines
def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
temp_f = temp_c * 9.0 / 5.0 + 32.0
return temp_f
def render_GET(self,request):
temp = self.read_temp()
self.payload = "new sensor value ::{}".format(str(temp))
return self
def render_PUT(self,request):
self.payload = request.payload
return self
def render_POST(self,request):
res = TempResource()
res.location_query = request.uri_query
res.payload = request.payload
return res
def render_DELETE(self,request):
return True
应该发生的是,当访问服务器并且选择了Temp_Sensor对象时,它应该回显当前温度。我已经单独运行了温度传感器,它正在运行并发出信号。我可以使用Copper Extension和Chrome访问服务器。但是,结果是值始终为空,并且出现相同的错误“ TypeError:read_temp()接受0个位置参数,但给出了1个。”但是,我没有给它任何参数。
谢谢