Depending on your application architecture I'd look into nsq (https://nsq.io/ https://nsq.io/) which works quite differently from most message brokers in that y

Depending on your application architecture I'd look into nsq (https://nsq.io/ https://nsq.io/) which works quite differently from most message brokers in that you're supposed to run one instance of the broker per server so you always have one local instance that you can publish to, no matter the current network conditions.