Cisco today said it reached a deal to buy Sentryo, a Lyon, France-based IoT security company. The companies didn’t disclose the purchase price.

Sentryo, founded in 2014, automates device visibility and security for industrial control system networks. It has about 34 employees and raised $13.5 million in a seed and Series A funding round that closed last December. Its customers are in the energy, manufacturing, oil and gas, and transportation sectors.

The two companies already work together on Cisco’s IoT networking platforms, which launched in January. The platforms incorporated Sentryo’s Edge Sensor and Cisco’s industrial networking hardware and IOx networking software.

“By combining Cisco’s intent-based network architecture with Sentryo’s capabilities, customers can capture IoT benefits, manage networks and devices at scale, enable collaboration across IT and OT [operational technology] departments, and better protect their assets and data,” wrote Rob Salvagno, vice president of corporate development and Cisco Investments, in a blog post about the acquisition.

In a separate blog post, Liz Centoni, senior vice president and general manager of Cisco’s IoT Business Group, said Sentryo’s OT asset automation security will help customers solve three specific problems. The first is visibility with network-enabled passive deep packet inspection capabilities to discover IoT and OT assets. “Sentryo’s sensor is natively deployable on Cisco’s IOx framework, it can be built into the industrial network these devices run on instead of adding additional hardware,” she wrote.

The second is segmentation to secure these environments. To this end, Cisco will integrate Sentryo’s device identification with with DNA Center and Identity Services Engine to allow customers to define segmentation policy.

And finally, Sentryo’s technology will improve customers’ OT environments with benefits including maximum uptimes, better production yields, and safety with its operational visibility capabilities like programmable logic controller (PLC) start/stop, operational events, and programming changes being made to PLCs, remote terminal units, and other industrial devices, she wrote.

The companies expect the acquisition to close before the end of Cisco’s first-quarter fiscal year 2020, which ends Oct. 26.

Cisco has made a number of other IoT-related investments over the past few years, beginning with its 2016 acquisition of Jasper for $1.4 billion. Cisco based its connected device platform on Jasper, and has continued to add additional features to its IoT platform such as monitoring and support for low power WAN IoT connectivity standards such as narrowband IoT (NB-IoT) and LTE-M.

The company also launched a suite of IoT security products and services in 2017.

Also in 2017, Cisco bought AppDynamics for $3.7 billion and then shifted that company’s focus to IoT. And last year, Cisco extended its intent-based networking technology to support IoT.

In December, IHS Markit ranked Cisco as the No. 2 IoT platform vendor behind Huawei.