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WLAN Topologies

The Avisaro WLAN products allow 'tweak' wireless networks to achive better results for industry requirements.

Infrastructure networks (using one Access Point)

Building a wireless network using an Access Point is the most common setup. The Access Point coordinates all wireless traffic - this makes those networks reliable and robust. On the downside an Access Point is required.

Basically all types of WLAN Access Point will be fine for the use with the Avisaro WLAN Devices.

Access Point Network

Infrastructure networks (using multiple Access Points)

If there are multiple Access Points using the same network name (SSID), the Avisaro Device connects to one available AP. Which AP is selected is rather random - any AP with enough signal strength could be connected to.

However, in some applications it is necessary to select one specific Access Point. Using the "wlan bssid pin" (Mehr more) command, a module can be fixed to connect to only one specific Access Point.

Adhoc networks (using direct device to device communication)

The adhoc communication between two or more WLAN devices is supported.

Adhoc

Adhoc networks (advanced setting for 'hopping' or 'meshed' networks)

Avisaro supports advanced adhoc network configuration.

Typically, it is a 'problem' if adhoc networks become large - communication breaks down or certain requirements apply in terms of the order those modules need to switched on.

Avisaro solves that problem by special naming convention. (Mehr more) .

Extended Adhoc


Technical Background:

In adhoc networks, the network name (SSID) is usually translated into a network number (BSSID). If a WLAN device is switched on, it checks whether there is allready another WLAN client active. If not, this client 'creates' an adhoc network by generating a BSSID and broadcasting this. If a second WLAN client is switched on, it sees the other client and adoptes the issued BSSID. Other WLAN clients can join this network as well.

Assuming in an large adhoc network, another WLAN client far away from the already operational client is switched on. This client does not see the first one and assumes it is first to open up an Adhoc network. It creates a new BSSID. Jet another WLAN client is switched on in the middle of the two Adhoc islands - this client decides randomly which network to connect to by adopting one or the other BSSID. However: two network islands are created, unable to communicate with each other.

With the special adhoc feature, Avisaro can force a WLAN Client to create a given BSSID. Thus, every time the same BSSID is created. This way, all clients can communicate no matter which order they were switched on. 

Commands to work with WLAN settings

Some of the commands to work with WLAN are:

WLAN Sets all parameters such as network name, type and encryption

SCAN Checks for network in the neighborhod of the Avisaro device