ioNIC HTTP Client Arduino Example

The W55RP20-S2E is configured as an HTTP client via UART or SPI, enabling it to send GET requests to an HTTP server and receive responses.

COMPONENTS Hardware components

WIZnet - W55RP20-EVB-Pico

x 1

Software Apps and online services

Arduino - Arduino IDE

x 1

PROJECT DESCRIPTION

How to HTTP Client Example

This example demonstrates how the Raspberry Pi Pico transmits AT commands to the W55RP20 S2E board via UART or SPI to configure it as a HTTP Client(TCP Client) device.

The Raspberry Pi Pico sends an HTTP GET command to the W55RP20 S2E board via UART or SPI, and when the board receives a response from the PC’s HTTP server, it retransmits the response back to the Raspberry Pi Pico through UART or SPI.

Step 1: Prepare software

The following serial terminal programs are required for test, download and install from below links.

Arduino IDE
Tera Term
Hercules

Step 2: Prepare hardware

1. Connect GPIO13 according to the selected UART/SPI mode of the W55RP20 EVB Pico, as illustrated below.

GPIO13 Pin	Desc
LOW(GND)	UART mode (default)
HIGH(3.3V)	SPI mode

2. Connect the Raspberry Pi Pico and the W55RP20 EVB Pico using jumper wires as shown below, depending on the selected UART/SPI mode.

If UART mode :

Raspberry Pi Pico	W55RP20 EVB Pico
GPIO4 (UART_TX)	GPIO5 (UART_RX)
GPIO5 (UART_RX)	GPIO4 (UART_TX)
GND	GND

If SPI mode :

Raspberry Pi Pico	W55RP20 EVB Pico
GPIO2 (SPI_CLK)	GPIO2 (SPI_CLK)
GPIO3 (SPI_TX)	GPIO4 (SPI_RX)
GPIO4 (SPI_RX)	GPIO3 (SPI_TX)
GPIO5 (SPI_CS)	GPIO5 (SPI_CS)
GPIO26 (SPI_INT)	GPIO26 (SPI_INT)
GND	GND

3. Connect the Raspberry Pi Pico to your PC (desktop or laptop) using a 5-pin Micro USB cable.

4. Connect the W55RP20 EVB Pico to your PC (desktop or laptop) using a USB Type-C cable.

Step 3: Arduino IDE Setup

Install Board Support Package

Open Arduino IDE
Go to File → Preferences
Add the following to "Additional Boards Manager URLs": https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
Go to Tools → Board → Boards Manager
Search for "Raspberry Pi Pico" and install Raspberry Pi Pico/RP2040 by Earle F. Philhower, III
Select Tools → Board → Raspberry Pi RP2040 Boards → Raspberry Pi Pico

Step 4: Code Examples

Each example provides a .ino file to upload to the Pico.

Step 5: Upload and Test

5.1 Select Raspberry Pi Pico

Go to Tools → Board → Raspberry Pi RP2040 Boards → Raspberry Pi Pico
Select Tools → Port → Choose your COM port

5.2 Upload Code

Open the desired example .ino file
Modify IP addresses and port numbers as needed

// Network config
static const char *REMOTE_HOST = "INPUT_YOUR_HOST_IP";
static const char *REMOTE_PORT = "8080";
static const char *HTTP_PATH = "/";

void setup() {
...
  at_set("LI192.168.11.2");    // Local IP
  at_set("SM255.255.255.0");   // Subnet mask
  at_set("GW192.168.11.1");    // Gateway
  at_set("DS8.8.8.8");         // DNS
  at_set("LP5000");            // Local port
  ...
}

Click Upload button or press Ctrl+U
Wait for upload to complete

5.3 Open Serial Monitor

Go to Tools → Serial Monitor
Set baud rate to 115200
Verify network information and connection status

Step 6: Run

Step 6.1:PC(HTTP Server)

To test the HTTP Client example, you need to run an HTTP server on your PC.
Enter the following commands in a terminal window to start the HTTP server.

## Windows cmd.exe

> mkdir http_test_dir
> cd http_test_dir
> echo Hello W55RP20-S2E> index.html						# make html file for test

> npm install -g http-server    										# install http server
> http-server . -p 8080														# run http server

Step 6.2: UART/SPI mode

Documents

ioNIC HTTP Client Example

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