Amazon Sidewalk
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Amazon Sidewalk is a shared, low-bandwidth wireless network operated by Amazon that pools a small slice of participating devices’ internet bandwidth to extend connectivity to nearby low-power devices. It uses Bluetooth for short range and 900 MHz radio (including LoRa) for longer range, and it is designed to keep devices such as trackers and sensors connected beyond the range of a single home’s WiFi. It is a company-operated network that ultimately relies on participants’ internet gateways.
How it works
Sidewalk uses compatible Amazon devices, such as certain Echo and Ring products, as bridges. Each bridge shares a small, capped portion of its owner’s internet bandwidth, and nearby low-power devices connect through the nearest bridge to reach the internet. Short-range links use Bluetooth, and longer-range links use sub-GHz 900 MHz radio, including LoRa.
The design target is low-bandwidth, intermittent connectivity for small devices: finding a lost tracker, keeping a sensor reporting at the edge of WiFi range, or covering a neighborhood with light coverage from many bridges. Amazon operates the network and manages the connection back to the internet.
Sidewalk is opt-in per Amazon account, and it depends on bridges that have internet access. It is not a peer-to-peer mesh among arbitrary phones, and it is not designed to operate independently of the internet.
Why it matters
Sidewalk shows the value of pooling range: many small contributions of coverage add up to a network that reaches devices no single gateway could. For low-power trackers and sensors, that extended, always-available reach is genuinely useful.
Its constraints are equally defining. It is operated by a single company, its bridges depend on the internet, and its bandwidth is intentionally small, so it is not built for infrastructure-independent coordination or for moving substantial data.
How it relates to Offline Protocol
Offline Protocol addresses a different case. Its mesh, DORS, runs directly among phones over BLE and WiFi Direct and keeps working with no internet at all, using the internet only as one optional transport with automatic failover. Where Sidewalk extends internet reach to small devices through company-operated bridges, a phone-native mesh coordinates the phones people carry, offline, relaying up to 8 hops with encrypted, higher-bandwidth links, including files up to 100MB.
Sessions are encrypted with MLS (RFC 9420) and peers authenticate with Ed25519 identities. See peer-to-peer mesh networking for the transport.
Frequently asked questions
Does Amazon Sidewalk work without internet?
No. Sidewalk extends coverage to low-power devices through bridges that share a slice of their owner’s internet bandwidth, so it ultimately depends on internet-connected gateways. A phone-native mesh such as Offline Protocol keeps working with no internet at all.
What radios does Amazon Sidewalk use?
It uses Bluetooth for short-range links and 900 MHz sub-GHz radio, including LoRa, for longer range, tuned for low-bandwidth, intermittent connectivity to small devices.
Is Amazon Sidewalk a peer-to-peer mesh?
Not in the field-coordination sense. It is a company-operated network that bridges small devices to the internet through participating gateways, rather than a peer-to-peer mesh among arbitrary phones that operates independently of infrastructure.
