我正在尝试在 ESP32 上使用 Micropython 执行简单的 get 请求。不幸的是我一直得到
OSError: -202
。
这就是我到目前为止所拥有的:
wlan.py
import network
wlan = network.WLAN(network.STA_IF) # create station interface
wlan.active(True) # activate the interface
wlan.connect('Schmittli', 'the key') # connect to an AP
wlan.ifconfig() # get the interface's IP/netmask/gw/DNS addresses
这是 REPL 输出:
>>> import wlan
import wlan
I (19080) wifi:wifi driver task: 3ffd1058, prio:23, stack:3584, core=0
I (38466) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (38466) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (38506) wifi:wifi firmware version: 44aa95c
I (38506) wifi:config NVS flash: enabled
I (38506) wifi:config nano formating: disabled
I (38506) wifi:Init dynamic tx buffer num: 32
I (38506) wifi:Init data frame dynamic rx buffer num: 32
I (38516) wifi:Init management frame dynamic rx buffer num: 32
I (38516) wifi:Init management short buffer num: 32
I (38526) wifi:Init static rx buffer size: 1600
I (38526) wifi:Init static rx buffer num: 10
I (38536) wifi:Init dynamic rx buffer num: 32
W (38536) phy_init: failed to load RF calibration data (0x1102), falling back to full calibration
I (38676) phy: phy_version: 4180, cb3948e, Sep 12 2019, 16:39:13, 0, 2
I (38696) wifi:mode : sta (30:ae:a4:f6:0f:08)
I (38696) wifi: STA_START
>>> I (38816) wifi:new:<1,0>, old:<1,0>, ap:<255,255>, sta:<1,0>, prof:1
I (39666) wifi:state: init -> auth (b0)
I (39676) wifi:state: auth -> assoc (0)
I (39686) wifi:state: assoc -> run (10)
I (39706) wifi:connected with Schmittli, aid = 28, channel 1, BW20, bssid = a0:b5:49:00:c6:cd
I (39706) wifi:security type: 3, phy: bgn, rssi: -53
I (39706) wifi:pm start, type: 1
I (39716) network: CONNECTED
I (39776) wifi:AP's beacon interval = 102400 us, DTIM period = 3
I (42456) event: sta ip: 192.168.1.118, mask: 255.255.255.0, gw: 192.168.1.1
I (42456) network: GOT_IP
>>> import urequests
import urequests
I (72686) modsocket: Initializing
>>> response = urequests.get('http://jsonplaceholder.typicode.com/albums/1')
response = urequests.get('http://jsonplaceholder.typicode.com/albums/1')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "urequests.py", line 108, in get
File "urequests.py", line 53, in request
OSError: -202
我尝试了两个不同的 ESP32 板,所以我认为这不是硬件问题。是的,该 URL 在我的浏览器中运行良好。
更新
使用其 IP 地址请求相同的服务是有效的。所以这是一个 DNS 问题。我在同一个 WLAN 上有 10 多个不同的设备。一切都工作正常。所以我真的认为这是一个 Mircopython 问题。
这是ESP32连接WLAN后的配置:
>>> wlan.ifconfig()
wlan.ifconfig()
('192.168.1.116', '255.255.255.0', '192.168.1.1', '42.2.18.11')
在我的所有其他设备中,DNS 服务器是“192.168.1.1”。我尝试在 ESP32 中手动设置 DNS 服务器,但这不起作用:
>>> wlan.ifconfig('192.168.1.116', '255.255.255.0', '192.168.1.1', '192.168.1.1')
wlan.ifconfig('192.168.1.116', '255.255.255.0', '192.168.1.1', '192.168.1.1')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: function expected at most 2 arguments, got 5
>>> wlan.status()
有什么想法吗?
您的 DNS 服务器似乎由于某种原因未将 FQDN 解析为 IP 地址。
print(wlan.ifconfig())
以检查您在最后半字节中分配的 DNS 服务器import socket
print(socket.getaddrinfo('micropython.org', 80))
print(socket.getaddrinfo('jsonplaceholder.typicode.com', 80))
# sample return
[(2, 1, 0, 'micropython.org', ('176.58.119.26', 80))]
[(2, 1, 0, 'jsonplaceholder.typicode.com', ('104.27.188.192', 80))]
如果不是您的名称解析,您可能会遇到防火墙。
在 wlan.ifconfig('192.168.4.1', '192.168.1.116') 中仅添加两个参数