Amazon's low-bandwidth, long-range IoT network, Sidewalk, has grown rapidly and is now available for third-party device makers to integrate.

Sidewalk currently links many of Amazon’s devices, including Echo smart speakers and Ring doorbells, to create a network that now covers nine out of 10 Americans.

Amazon has announced that it’s opening applications for hardware development test kits that will enable third-party companies to validate the Sidewalk network and...