[Digi-Key Follow me Issue 2] + Task 2: Use of network functions

sipower

[Digi-Key Follow me Issue 2] + Task 2: Use of network functions [Copy link]

 

1. Create a WiFi hotspot

Circuitpython is really good. The function of creating a WiFi hotspot only requires this one line of code:

wifi.radio.start_ap(HOT_POINT_SSID, HOT_POINT_PASSWORD)

Code:

import wifi

wifi.radio.start_ap(ssid='hahaha', password='12345678')

Figure 1. Creating a WiFi hotspot

2. Connect to WiFi

Connecting to wifi is also very simple, just this line of code:

wifi.radio.connect(secrets["ssid"],secrets["password"])

Figure 2. Connecting to WiFi

3. Connect to computer to send and receive messages

The following is a TCP communication test. The development board is connected to the TCP server on the computer. The computer sends a message to the development board. After the development board receives it, it prints it out in the terminal and sends it back to the computer. The program is as follows.

import wifi

wifi.radio.connect('xxxxxxxxxxxxxx', 'xxxxxxxxxxxxxx')
print(f"My IP address: {wifi.radio.ipv4_address}")

import socketpool
import time

HOST = "192.168.31.228"
PORT = 7777
TIMEOUT = 30


pool = socketpool.SocketPool(wifi.radio)
print("Creating Socket")
sock=pool.socket(pool.AF_INET, pool.SOCK_STREAM)
sock.settimeout(TIMEOUT)
sock.connect((HOST, PORT))
sent = sock.send(b"start\n")
while  True:    
    buff = bytearray(5)
    numbytes = sock.recv_into(buff)
    if(numbytes > 0):
        print(buff)
        sent = sock.send(buff)
    time.sleep(1)

The operating effect is as follows.

Figure 3: Transmitting and receiving test

The wheels made on Circuitpython are very complete, and most common functions can be implemented with just a few lines of code, making it relatively easy to get started.

wangerxian

If the computer's TCP service is not enabled, and the computer's TCP service is enabled only after the microcontroller is started, can I still connect to the computer's TCP service?

sipower

wangerxian posted on 2023-8-31 14:12 If the computer's TCP service is not enabled, and the computer's TCP service is enabled only after the microcontroller is started, can I still connect to the computer's TCP service?

Not tested, will try again later

sipower

sipower posted on 2023-8-31 17:09 Not tested, will try later

sock.connect((HOST, PORT))

About 20 seconds after this line of command is run, if the PC server is not opened, an error will be reported. If it is opened during this period, the connection will be possible.

秦天qintian0303

Python is indeed convenient, but how do you design the various firmware yourself? The while part in wifi is indispensable.

sipower

Qintianqintian0303 posted on 2023-9-1 09:06 Python is indeed convenient, but how can I design various firmwares by myself? The while part in wifi is indispensable

It seems that microPython supports multitasking, but I haven’t studied it that deeply yet.