This is a sort of follow-up post to ZeroMQ, iOS and
Python from a year
ago. I again wrote a test app and server. Of the earlier components, iOS
stayed, but ZeroMQ I replaced with WebSockets and the server is this time
written in Clojure.
Idea of the exercise is the same as last time: two-way communication between
an iOS client and server over a persistent connection. WebSockets is a more
mainstream technology than ZeroMQ with a wide variety of servers available,
even if it is a young spec and not quite everything has stabilized yet.
On the iOS side there's two options, short of writing the protocol
Square's SocketRocket. I went for
SocketRocket. It's available from CocoaPods and at
least in this brief test worked fine.
Last time I was planning on doing the server in Clojure but ran out of
patience. This time the technology stack was easier. I pretty much followed
Jay Fields' example with just a few changes here and there and had a server
running in no time.
The system doesn't do anything fancy, or do it particularly beautifully: the
app waits for a button tap, sends a number wrapped in JSON to the server, the
server increments it and sends it back.
The code is on BitBucket as