硬件评估

RE: 硬件评估

MartinBL — Fri, 16 Nov 2018 09:20:35 GMT

Being a Router requires a lot of memory and current because it needs to keep track of other nodes in the network and has its radio on continuously. End Devices are typically memory and current constrained. Hence, dedicated End Devices cannot become routers. However, a Router can act as an End Device.

From the documentation in my link:

Router

A Router is a node that:

forwards packets for network devices
provides secure commissioning services for devices trying to join the network
keeps its transceiver enabled at all times

End Device

An End Device (ED) is a node that:

communicates primarily with a single Router
does not forward packets for other network devices
can disable its transceiver to reduce power

Device types

Furthermore, nodes comprise a number of types.

Full Thread Device

A Full Thread Device (FTD) always has its radio on, subscribes to the all-routers multicast address, and maintains IPv6 address mappings. There are three types of FTDs:

Router
Router Eligible End Device (REED) — can be promoted to a Router
Full End Device (FED) — cannot be promoted to a Router

An FTD can operate as a Router (Parent) or an End Device (Child).

Minimal Thread Device

A Minimal Thread Device does not subscribe to multicast traffic and forwards all messages to its Parent. There are two types of MTDs:

Minimal End Device (MED) — transceiver always on, does not need to poll for messages from its parent
Sleepy End Device (SED) — normally disabled, wakes on occasion to poll for messages from its parent

An MTD can only operate as an End Device (Child).

RE: 硬件评估

chuzhaonan — Wed, 14 Nov 2018 08:45:38 GMT

Sorry,I can't open this page

RE: 硬件评估

MartinBL — Wed, 14 Nov 2018 08:39:07 GMT

Please refer to this documentation: Node Roles and Types.

RE: 硬件评估

chuzhaonan — Tue, 13 Nov 2018 08:37:34 GMT

I don't known who is my area sales manager. My address is Hangzhou, Zhejiang, China.

The end device of this series can also be used as a router, the router can also be used as an end device, and the router can also act as a co-ordinator?

RE: 硬件评估

MartinBL — Tue, 13 Nov 2018 08:23:35 GMT

Hi,

For sample requests please contact our regional sales manager for your area. If you don't know who that is please send me a PM and I'll give you his details.

RE: 硬件评估

chuzhaonan — Tue, 13 Nov 2018 01:29:39 GMT

Could you provide two NRF52840 demo boards for me to test?

RE: 硬件评估

MartinBL — Mon, 12 Nov 2018 10:18:31 GMT

Hi,

I don't understand what those symbols mean, but google translate says it is Chinese and translates it to:

"I would like to know how far the maximum access distance of neighboring devices is when NRF52840 is used as a wireless network. How many devices can I access at most?"

Q1) maximum access distance:
This depends on your environment, network protocol, and device configuration. You will get better range in an open field (line of sight) than you will inside a building for example. Please refer to these two blogs:
Testing Long Range (Coded PHY) with Nordic solution
Exploring Bluetooth 5 - Going the Distance

Q2) How many devices can I access at most?
That also depends on your chosen network protocol. By using BLE Mesh, Thread, or Zigbee you can have thousands of devices in a single network. If you go for Bluetooth low energy then a single device can connect to 20 other devices.