![]() It doesn't return the names of networks, just the number. That returns the number of networks available. It's very common to scan for networks so they they provide a function, WiFi.scanNetworks. Sort of answering the question which SSID should I connect to? So one thing is you're gonna wanna scan for networks. With WiFi, you often want to scan, look at the networks around you, and pick one to connect to. You're plugged into a network and that's that. This is something you don't generally do with Ethernet, you're not scanning for Ethernet networks. And then you call server.begin to start the server listening on the port, actually that's the same as with the Ethernet library too. Before with the Ethernet we said server equals our Ethernet server port, but it accomplishes the same goal. When you want to access the server you call server with port, it's phrased a little bit differently. ![]() Now WiFiServer it invokes slightly differently. This is actually the same as with the Ethernet client. So you call client connect, nnect with that IP address and a port. So you create a WiFiClient if you're acting as the client and you client connect. Now so once you've connected, once you've joined the network, then a lot of this part about you acting as a client and a server is very similar to the Ethernet shield, so instead of an Ethernet client, you've got a WiFiClient. So all four of these options are different ways that you can set up your connection, depending on the type of network that you're using. #ARDUINO WIFI SHIELD PASSWORD#And the key is going to effectively be the password that you are using to get into the network. So key index is going to be the number of the key that you are choosing. So this is used when the network uses WEP encryption, and when it does that, WEP encryption has several keys, you can have up to four different keys to choose from. Now another way to do it is to call WiFi.begin with three arguments, the SSID, and then a key index, and a key. You would use this if the network had WPA2 encryption and it required a password, so you pass the password as an argument to that you could connect to the network. The first argument is the SSID, the second argument is the password. Now, you can also call WiFi.begin with two arguments. You pass that as an argument,it'll connect to that network. With WiFi you often can view many networks, so you gotta pick one and SSID is the name of that network. You don't have a choice of networks to connect to, you've just got a network, and you connect to it. Now this is something you don't generally have with an ethernet shield. SSID is the name of the network that you wanna connect to. Now, a common way to do it is to call WiFi.begin with one argument, ssid. ![]() ![]() Just no arguments, it powers up the shield and initializes it. No arguments, if you pass no arguments it just initializes the shield, so that's one way to call Wifi.begin. WiFi Initialization, so what do you do first? Wifi.begin so that's very common. So, the library is similar to the Ethernet library, not exactly the same. The IEEE standard uses is 802.11 There are varieties of this, V, there are suffixes, N, I can't remember which one they're on now, but 802.11 something is the current WiFi standard. Now there are some differences, and we'll talk about those. Sending data on one shield versus sending on another is a very similar operation. ![]() So in a lot of ways it's very similar from a programmer's point of view. It allows you to connect to the internet, but it does it through a wireless interface, rather than a wired interface like an ethernet shield would do. Actually it's relatively similar, I mean what it does at a high level is basically the same thing as a ethernet shield. So we talked about the ethernet shield, and now we'll talk about a WiFi shield. ![]()
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