Question

I’ve spent a few days looking for different solutions, but the whole area is quite complicated, and I’m wondering if anybody knows of any project where I can simply transfer NSData or an NSString or some other simple file over wifi to another iPhone on the network?

Answer 1

Np. Use bonjour to search for devices. Then use CocoaAsyncSocket to send and receive data. It works like a charm.

Little info about AsyncSock:

GCDAsyncSocket and AsyncSocket are TCP/IP socket networking libraries.
Here are the key features available in both:

Native objective-c, fully self-contained in one class. No need to muck
around with sockets or streams. This class handles everything for you.

Full delegate support Errors, connections, read completions, write
completions, progress, and disconnections all result in a call to your
delegate method.

Queued non-blocking reads and writes, with optional timeouts. You tell
it what to read or write, and it handles everything for you. Queueing,
buffering, and searching for termination sequences within the stream –
all handled for you automatically.

Automatic socket acceptance. Spin up a server socket, tell it to
accept connections, and it will call you with new instances of itself
for each connection.

Support for TCP streams over IPv4 and IPv6. Automatically connect to
IPv4 or IPv6 hosts. Automatically accept incoming connections over
both IPv4 and IPv6 with a single instance of this class. No more
worrying about multiple sockets.

Support for TLS / SSL Secure your socket with ease using just a single
method call. Available for both client and server sockets.