Python HTTP Request Communication

Python HTTP Request Communication

This chapter introduces how to use a Python demo to communicate with the robotic arm through HTTP requests.
HTTP (Hypertext Transfer Protocol) is a protocol for data communication on the Web, which is an object-oriented protocol on the application layer. It realizes wireless communication mainly based on the WiFi module in a simple, flexible Request-Response model.
Before running the Python demo, you need to install Python on your systems, configure the Python virtual environment, and install all the packages needed for demos. For more details, you can refer to RoArm-M2-S Python UART Communication.
There are four Python demos on the RoArm-M2-S. The Python demo for HTTP request communication is http_simple_ctrl.py as shown below:

import requests
import argparse


def main():
    parser = argparse.ArgumentParser(description='Http JSON Communication')
    parser.add_argument('ip', type=str, help='IP address: 192.168.10.104')

    args = parser.parse_args()

    ip_addr = args.ip

    try:
        while True:
            command = input("input your json cmd: ")
            url = "http://" + ip_addr + "/js?json=" + command
            response = requests.get(url)
            content = response.text
            print(content)
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    main()

Before running the demo, you need to confirm the IP address of the robotic arm, which is related to the WiFi mode of the robotic arm. For more details, you can refer to RoArm-M2-S WIFI Configuration.

• If the WiFi mode of the robotic arm is in AP mode, the IP address is 192.168.4.1.
• If the WiFi mode of the robotic arm is in STA mode, the IP address can be obtained from the OLED screen.

Using the following commands to run the HTTP for communication demo request, The IP address in the command should be changed to the IP address of your robotic arm.

python http_simple_ctrl.py 192.168.4.1

Note: In either mode, the robotic arm needs to be on the same LAN as the device on which the script is running.

After running, you can view the returned information, and then input the JSON commands, or you can get the feedback from the robotic arm for communication.
For more details, you can refer to RoArm-M2-S JSON Command Meaning.

Demo

• RoArm-M2-S Python Demo