help with 255 errors about node-apn HOT 2 CLOSED

I have misappropriated this error code a little. As it says in the readme, under "Handling Errors"

The cacheLength option for the connection specifies the number of sent notifications which will be cached, on a FIFO basis for error handling purposes. If cacheLength is not set to a large enough value, then in high volume environments, a notification - possibly including some subsequent notifications - may be removed from the cache before Apple returns an error associated with it. In this case the errorCallback will still be called, but with a null notification and error code 255. If this happens you should consider increasing cacheLength to prevent losing notifications. All the notifications still residing in the cache will be resent automatically.

from node-apn.

I am also looking at having the cache length change dynamically for environments where large numbers of notifications fail, this is still in the pipeline however, so it may not be available very soon.

from node-apn.