Application overview

The UDP client application demonstrates how to open and use a standard UDP client socket and send data over a  server socket  on Quessence.

Click here to download the source code for the UDP Client Socket Application

Setup required

  1. Quessence
  2. 32/64-bit PC with minimum 2GB RAM and USB port for power, downloading and debugging software
  3. Windows 7/8/8.1/10 Operating System. It should have the Keil IDE and the CMSIS DAP drivers installed on it. Refer to installation section for download and installation steps.
  4. A windows machine (as a WiFi Station) with any UDP client application (This example uses iperf).

Configure the application

Use an IDE to edit udp_client.c file available in the path UDP_Client/Applications/src/udp_client.c to make following changes.

Macro Value Description
This macro refers to the SSID name of your Access point to connect.

This macro refers to particular channel used to scan by the device.If channel is 0 then it will scan all channels.
This macro refers to the security type of Access point to connect.supports security types like OPEN,WEP,WPA,WPA2
This macro refers to the Pre-shared key of the connected Access point.
This macro is to configure port number given to the client (WyzBee).
This macro is to configure port number of the remote server.
This macro is to configure IP address of the remote server.

This macro is to configure number of packets to send
This macro is to configure Application memory length which is required by the driver


To configure IP for configured station through dhcp set DHCP_MODE  to 1, else configure to 0

NOTE – In this application we are not providing the facility to configure the Access point’s IP parameters

To configure static IP address

IP address to be configured to the device should be in long format and in little endian byte order.

Example: 1.To configure “” as IP address,update the macro DEVICE_IP as 0x650AA8C0.

2. To configure “” as Gateway,update the macro  GATEWAY as 0x010AA8C0.

3.To configure “” as network mask,update the macro NETMASK as 0x00FFFFFF 

#define  DEVICE_IP    
#define  GATEWAY      
#define  NETMASK      


A sample configuration is shown in the below snapshot

Edit the WLAN configuration file

Check the following macros of rsi_wlan_config.h file available in the path UDP_Client/Libraries/Wireless/include

Macro Value


Execute the Application

  • Connect Quessence to the Windows PC running Keil IDE.
  • Configure the macros in the files  udp_client.c and rsi_wlan_config.h as mentioned above.
  • Open an UDP server socket using iperf (using command iperf_demo.exe –s -u -p -i 1 ) available in Udp_client application folder by connecting the windows machine(wifi station) to the same AP which device is connecting.

  • On connecting windows machine (as a WiFi Station) to the same SSID, IP address is obtained. Enter this ip in the SERVER_IP_ADDRESS macro in tcp_client.c
  • Build and launch the application.
  • Quessence connects to the configured access point.It then connects to the iperf server and sends number of packets pre-configured byNUMBER_OF_PACKETS.