PubNub nabs $23M as its IaaS network hits 1.3T messages sent each month

There's been a huge increase in the last decade of applications and services that rely on real-time notifications and other alerts as a core part of how they operate, and today one of the companies that powers those notifications is announcing a growth round. PubNub -- an infrastructure-as-a-service provider that provides a real-time network to send and manage messaging traffic between companies, between companies and apps and between internet-of-things devices -- has raised $23 million in a Series D round of funding to ramp up its business internationally, with an emphasis on emerging markets. The round adds another strategic investor to PubNub's cap table: Hewlett Packard Enterprise is coming on as an investor, joining in this round previous backers Sapphire Ventures (backed by SAP), Relay Ventures, Scale Venture Partners, Cisco Investments, Bosch and Ericsson.