removeSubscription method
Implementation
void removeSubscription(ReqSubscribeController controller) {
var path = controller.node.remotePath;
if (subscriptions.containsKey(path)) {
toRemove[subscriptions[path]!.sid] = subscriptions[path]!;
prepareSending();
} else if (subscriptionIds.containsKey(controller.sid)) {
logger.severe(
'unexpected remoteSubscription in the requester, sid: ${controller.sid}',
);
}
}