There’s been a huge boom in the last decade of applications and services that rely on 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, companies and apps, and betweeninternet-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 previous backers Sapphire Ventures (backed by SAP), Relay Ventures, Scale Venture Partners, Cisco Investments, Bosch and

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