【得捷电子Follow me第2期】任务2：网络功能使用

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【得捷电子Follow me第2期】任务2：网络功能使用 [复制链接]

# 【得捷电子Follow me第2期】 任务2：网络功能使用
ESP32本身内置Wifi模块，只是CircuitPython第一次用还没太摸的明白，因此对于网络功能翻了半天的文档才把各项功能差不多了解一点。
## wifi连接
首先连接wifi，按照官方的建议，把ssid和密码保存在secrets.py中，这样避免在分享代码的时候泄露隐私。
```python
# This file is where you keep secret settings, passwords, and tokens!
# If you put them in the code you risk committing that info or sharing it

secrets = {
  'ssid' : 'xxxx',
  'password' : 'xxxxx',
  'timezone' : "Asia/Shanghai"
  }

```

然后在代码中连接该wifi就可以了：
```python
import wifi

wifi.radio.connect(secrets["ssid"], secrets["password"])
print("Connected to {}!".format(secrets["ssid"]))
print("IP:", wifi.radio.ipv4_address)
```

## 网络测试
简单测试一下网络
1. 官方测试接口http://wifitest.adafruit.com/testwifi/index.html
使用的是`adafruit_requests`这个库来进行网络请求

```python
import ssl
import socketpool
import adafruit_requests
import time

# 请求URLs
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"

print("ESP32-S2 WebClient Test")
print(f"My MAC address: {[hex(i) for i in wifi.radio.mac_address]}")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

print(f"Fetching text from {TEXT_URL}")
response = requests.get(TEXT_URL)
print("-" * 40)
print(response.text)
print("-" * 40)
```

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_724117" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=724117&handlekey=savephoto_724117">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

2. 联网获取当前时间
请求http://quan.suning.com/getSysTime.do 这个API

```python
import ssl
import socketpool
import adafruit_requests
import time

# 请求URLs
JSON_TIME_URL = "http://quan.suning.com/getSysTime.do"

print("ESP32-S2 WebClient Test")
print(f"My MAC address: {[hex(i) for i in wifi.radio.mac_address]}")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

print(f"Fetching and parsing json from {JSON_TIME_URL}")
response = requests.get(JSON_TIME_URL)
print("-" * 40)
print(f"Time: {response.json()['sysTime2']}")
print("-" * 40)
```

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_724116" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=724116&handlekey=savephoto_724116">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

(话说早知道CircuitPython的中文是拼音，就下英文版的了，看着也太别扭了。装完才发现也懒得重刷一遍了 :Onion-50:)

## 完整代码

```python
import wifi
from secrets import secrets 
import ssl
import socketpool
import adafruit_requests
import time

wifi.radio.connect(secrets["ssid"], secrets["password"])
print("Connected to {}!".format(secrets["ssid"]))
print("IP:", wifi.radio.ipv4_address)

# 请求URLs
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
JSON_TIME_URL = "http://quan.suning.com/getSysTime.do"

print("ESP32-S2 WebClient Test")

print(f"My MAC address: {[hex(i) for i in wifi.radio.mac_address]}")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

print(f"Fetching text from {TEXT_URL}")
response = requests.get(TEXT_URL)
print("-" * 40)
print(response.text)
print("-" * 40)

print()

time.sleep(3)

print(f"Fetching and parsing json from {JSON_TIME_URL}")
response = requests.get(JSON_TIME_URL)
print("-" * 40)
print(f"Time: {response.json()['sysTime2']}")
print("-" * 40)

print("Done")
```