I have written an XMPP daemon (using JAXL) for sending and recieving messages which seems to work OK except for one issue.
I can successfully send 10 to 15 messages to the users I want to send to, and then after that any message I send comes back with
<message type='error' ...><error code='503' type='cancel'></error></message>
I am using Google's talk servers to send from a Google Apps domain to another Google Apps domain.
Without posting all my code does anyone have any ideas what may be causing this. The bit that puzzles me is that I can send 10 to 15 messages first before it stops.
Sounds like you are hitting a rate-limiter. From the HTTP spec:
10.5.4 503 Service Unavailable
The server is currently unable to handle the request due to a
temporary overloading or maintenance of the server. The implication
is that this is a temporary condition which will be alleviated after
some delay. If known, the length of the delay MAY be indicated in a
Retry-After header. If no Retry-After is given, the client SHOULD
handle the response as it would for a 500 response.
A well-behaved service, which I would expect most of Google's to be, would be correct in returning such a response if it was rate-limiting something.