Wifi; Wifi Topologies; Access Point - Libelium Waspmote Technical Manual

12. WiFi

The WiFi module for the Waspmote platform completes the current connectivity possibilities enabling the direct communication
of the sensor nodes with any WiFi router in the market. As well as this, this radio allows Waspmote to send directly the information
to any iPhone or Android Smartphones without the need of an intermediate router, what makes possible to create WiFi sensor
networks anywhere using just Waspmote and a mobile device as all of them run with batteries.
With this radio, Waspmote can make HTTP connections retrieving and sending information to the web and FTP servers, as well
as using TCP/IP and UDP/IP sockets in order to connect to any server located on the Internet.
Features:
• Protocols: 802.11b/g - 2.4GHz
• TX Power: 0dBm - 12dBm (variable by software)
• RX Sensitivity: -83dBm
• Antenna connector: RPSMA
• Antenna: 2dBi/5dBi antenna options
• Security: WEP, WPA, WPA2
• Topology: AP
• 802.11 roaming capabilities
Actions:
• TCP/IP - UDP/IP socket connections
• HTTP web connections
• FTP file transfers
• Direct connections with iPhone and Android
• Connects with any standard WiFi router
• DHCP for automatic IP assignation
• DNS resolution enabled
Related API libraries: WaspWifi.h, WaspWifi.cpp
All information about their programming and operation can be found in the document: WiFi Networking Guide.
All the documentation is located in the

12.1. WiFi Topologies

12.1.1. Access Point

Sensor nodes may connect to any standard WiFi router which is configured as Access Point (AP) and then send the data to other
devices in the same network such as laptops and smartphones. This is the common case when implementing home sensor
networks and when using the data inside an Intranet.
Once associated with the Access Point, the nodes may ask for an IP address by using the DHCP protocol or use a preconfigured
static IP. The AP connection can be encrypted, in this case, you have to specify also the pass-phrase or key to the WiFi module.
The WiFi module supports these security modes: WEP-128, WPA2-PSK , WPA1-PSK, and WPA-PSK mixed mode.
Development section in the Libelium website.
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Figure: WiFi module with 2dBi and 5dBi antennas
WiFi
v6.3