raspberry pi 无法发出任何 url 请求，连接超时

Question

我需要将我的传感器数据更新为 thingspeak ，所以我使用 python thingspeak 库来完成它。前两天还好好的，现在不行了，连接超时，我也试过用urllib2更新，也没用。

我的网络连接很好，我可以在 Pi 上打开网页，我可以使用 thingspeak 库和 urllib2 从我的笔记本电脑更新频道。有人可以帮助我吗

我的 thingspeak 库代码：

node = False
channel_id = ""
write = ""
if data['MAC'] in ':ab:35':
 channel_id = "XXXXX"
 write = "XXXXXXXXXXX"
 node = True

if node:
 channel = thingspeak.Channel(id=channel_id,write_key=write)
 try :
     response=channel.update({1:data['TEMP'],2:data['VOLT'],3:data['PRES'],4:data['HUM']})
    print response
    print 'Thingspeak updated!!!'
 except :
    print "connection failed"

当我尝试 urllib2 时：

f = urllib2.urlopen(url)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 431, in open
  response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 449, in _open
  '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain
  result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 1240, in https_open
  context=self._context)
  File "/usr/lib/python2.7/urllib2.py", line 1197, in do_open
  raise URLError(err)
  urllib2.URLError: <urlopen error [Errno 110] Connection timed out>

当我尝试 thingspeak 库时：

>>> channel = thingspeak.Channel(id=c,write_key=w)
>>> res = channel.update({1:50,2:30,3:70,4:20})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build/bdist.linux-armv7l/egg/thingspeak/thingspeak.py", line 116,         in update
  File "/usr/lib/python2.7/dist-packages/requests/api.py", line 94, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/api.py", line 49, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 457, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 569, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/adapters.py", line 407, in send
    raise ConnectionError(err, request=request)

requests.exceptions.ConnectionError: ('Connection aborted.', 错误(110, 'Connection timed out'))

Answer 1

通过创建请求对象并将它们用作 urlopen 的参数来添加新的用户代理：

import urllib2

request = urllib2.Request('http://www.example.com/')
request.add_header('User-agent', 'Mozilla/5.0 (Linux i686)')

response = urllib2.urlopen(request)

Answer 2

我正在使用 raspberry-pi 向 thingspeak 发送数据。我所做的是这样的：

import httplib
import urllib

    #Preparing to send the information to the cloud
            params=urllib.urlencode({'field1':liters,'key':key})
            headers={"Content-typZZe": "application/x-www-form-urlencoded","Accept":"text/plain"}
            conn=httplib.HTTPConnection("api.thingspeak.com:80")

    #Sending the data to the thingspeak platform
            try:
                    conn.request("POST", "/update", params, headers)
                    response=conn.getresponse()
                    print response.status, response.reason
                    data=response.read()
                    conn.close()
            except:
                    print "connection failed"

而且效果很好。密钥是您频道密钥的字符串。

希望对您有所帮助。

Answer 3

如果我使用 SSH 并尝试运行脚本，它会起作用。

raspberry pi 无法发出任何 url 请求，连接超时

raspberry pi can't make any url requests, connection timed out

python

urllib2

raspberry-pi3