iPhone to control other devices

iPhone to control other devices, such as PC, car audio, etc., through the USB interface control or WIFI control ah,
Which heroes have experience in this area. < >

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can consider Bluetooth and wifi < >

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control the PC would need the same network, and then should be able to use the socket., of course, depends on what you control it. < >

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demand defined enough. What do you want to control, you define the corresponding application layer protocol. < >

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To control other hardware devices, first you have to need to get other devices corresponding command interface (or your own server application written for); For communication protocols, LAN you can use udp, you can choose to use the WAN transport layer or application layer tcp http protocol; way for communication: wifi (long range), Bluetooth (with distance limitations) and, of course, you also can use the data line control of < >

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some of it is still high reliability Bluetooth, car stereos, and more trouble with the USB, Wifi, it is not very convenient < >

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What kind of wireless protocols used?
same protocol wired it? < >

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wifi, bluetooth, such wireless devices. Its agreement with the wired the same?
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develop a unified device protocol, the use of network control. . . < >