For LoRaWAN development kit Server+Gateway gateway + node SX1278 open source | Компьютеры и офис

For LoRaWAN development kit Server+Gateway gateway + node SX1278 open source | Компьютеры и офис

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LorawanEvaluation Suite-FAQ:

1.Q: what does this kit help for developers?

Answer: using our suite, we can evaluate and test data communication format, communication distance, signal quality assessment, etc. under the Lorawan protocol; and we provideSx1301The device driver of the gateway module allows the user to integrate the core module of the gateway into the compatible driver.LinuxOn a system; providing terminal nodes at the same timeSDK,It can be used for two development,The most important thing is that we offerThe source of the private cloud server source can help you build a private cloud server quickly and save your precious time.

2.:What is LoRa?

3.Q: does this suite provide the hardware schematic and the chipbook?

Answer: the primary suite providesGateway application extension boardSchematic diagram and chip data (including a chip Handbook); terminal nodes providing hardware interface pin definition data and extended circuit schematic diagram, advanced SuiteGateway application extension boardSchematic diagram does not provide.

4.Q: what hardware interface does the sx1301 core gateway module provide?

Answer: modules with USB andSPIThe interface is used to communicate with the HOST host, USB andSPIThe two are two.

5.Q: what is the working frequency that this suite of assessment supports currently supports?

Answer: at present, the default is 470Mhz working band, if other frequency bands are required, please consult customer service.

6.Q: can the sx1301 core gateway module communicate with the single chip computer? such asSTM32.

Answer: at present, it does not support the communication between direct and ordinary singlechip, and can only be used with the Linux embedded development platform.

7.Q: is the sx1301 core gateway module interface definition?

Answer:The gateway interface is like the following diagram, and the details are shown in the kit.

8. What is the communication distance between the gateway and the terminal?

Answer: no shelter5~8Under the circumstances of the city2~3Kilometre.

Nine YouLoRAwanThe gateway, how many terminal modules can be supported in theory?

Answer:LorawanThe number of gateway support devices is closely related to the frequency of packet delivery, the size of packets, and the processing capability of the platform. ,theoretical support10000.

10What kind of technical support do you offer to buy your development kit? What are the ways?

Answer: first, the product has a complete technology manuals. As long as we follow the manual step by step, we can run through the process, provide full technical support for the use of the product itself, and then provide for the terminal nodes.SDKThe source code package is developed for two times, provides basic use guidance services, does not provide specific development guidance services, and provides the gateway again1301Gateway moduleLinuxDriver source, as a result ofLinuxIt is difficult to develop, and the cost of technical support is high, so the gateway does not provide technical support.

The technical support methods mainly include mail,QQThree ways of telephone.

11, Can the gateway module and the terminal module be purchased separately? What kind of resources do you provide?

Answer: separate1301Gateway module and terminal node moduleIn principle, it is only for mass users and customers who have purchased packages, because they are purchased alone.1301The gateway module, the terminal node module, does not provide technical support, only provides the usage description and the hardware interface definition.

12, Do you undertake the custom development of the project?

Answer: our company acceptsLorawanRelevant project customization, need to issue a demand document, after the technical staff assessment, then the business staff to reply to you.

13, Does the gateway module support the connection to other network servers?

Answer: the gateway of development kit is to connect to our network server. If we connect to other network servers, we need to install corresponding network servers on the gateway.SDKThe work is done by the customer or the network server manufacturer.

14, Development Suite supportedlorawanWhat is the version of the protocol?

Answer:Lorawan1.0.2

15, The development suite has been implementedClassA,ClassB,ClassC?

Answer: it is now realizedClassAandClassC

16Your gateway source code It's officialGitHubIs it open to open source?

Answer: the gateway is based on the officialGitHubOn the source code optimization, the solution of multiple officialBUGAnd the multiple optimization is carried out.

17And I think there's a raspberry pie in your suite. What do you do for it?

Answer: the raspberry pie is the main control board of the gateway, based onLinuxUsed for control.SX1301Gateway module.

18And your system must beNS(network server) can be used?NSIs it possible to use the network server?

Answer: now the Development Suite demo does not have to work togetherNS. Now we supportUsing embedded localNSThat is, in the gatewayLinuxEmbed on the main boardNSService.

NineteenQuestion: this suite providesNS(network server)?

Answer: provide NS (network server) cloud platform system andThe evaluation level NS embedded in the gateway (private cloud open source)

20. question: is LoRa spread-spectrum technology?

Answer: LoRa is a spread spectrum technology, but it is not direct sequence spread spectrum. Direct sequence spread spectrum (DSSS) is used to transmit more spectrum by modulating the carrier chip, thus improving the coding gain. The LoRa modulation is similar to the multistate FSK modulation, using the unmodulated carrier to make the linear frequency modulation, so that the energy is dispersed to a wider frequency band.

21. question: is LoRa a Mesh network, a point - to - point transmission, or a star network?

Answer: the LoRa modulation technology itself is a physical layer (PHY layer) protocol that can be used in almost all network technologies. Although the Mesh network extends the scope of network coverage, it has sacrificed network capacity, synchronization overhead and battery life. With the upgrading of LoRa technology link budget and coverage distance, Mesh network is no longer suitable. Therefore, star networking mode is adopted to optimize network structure, extend battery life and simplify installation.The LoRa gateway and the modules are netted in a star shaped network.In theory, LoRa modules can be organized by point to point polling. Of course, point - to - point polling is far less efficient than star networks.

The 22. question:LoRa technology andSIGFOX, where is the difference between NWave?

Answer: Generally speaking, LoRa technology adopts a spread spectrum technology, SIGFOX uses narrowband BPSK modulation technology, NWave uses Weightless standard, and is similar to SIGFOX technology.

At present, companies that use ultra narrow band technology can choose more transceiver chips, and LoRa can only use chips provided by Semtech.

23. question: what is the LoRa gateway?

Answer: the core position of the LoRa star network at the LoRa gateway is the terminal andThe information bridge between the server (Server),It's a multichannel transceiver.LoRa gateways are sometimes referred to as LoRa base stations or LoRa concentrators, although the definition is different, but it is actually the same meaning.

The LoRa gateway uses different spreading factors, and the different spreading factors are 22 orthogonal, so theoretically, we can demodulate several signals with different spreading factors in the same channel.Gateway and network server are connected by standard IP. The terminal communicates with one or more gateways through single hop. All terminal communication is two-way communication, and it also supports software remote upgrading.

At present, the definition is different, and the gateway type is different. For example, according to different application scenarios can be divided into indoor and outdoor type gateway gateway; according to the different communication styles can be divided into half duplex and full duplex gateway gateway; and in accordance with the design standards can be divided into full compliance with the LoRaWAN protocol gateway and does not fully comply with the LoRaWAN protocol gateway.

24. question: how large is the capacity of the LoRa gateway? How many terminals can a single gateway be connected to?

Answer: the gateway capacity refers to the ability of the gateway to receive the number of packets in a certain time.In theory, a single SX1301 chip has 8 channels, which can receive up to 15 million packets a day at most in compliance with the LoRaWAN protocol.If an application has a packet frequency of 1 packets / hours, a single SX1301 chip can connect to 62500 terminal nodes. Of course, this is just a theoretical value. The number of gateway access terminals is ultimately related to the number of gateway channels, the terminal packet frequency, the number of packet bytes and the spreading factor.

25. question: what are the factors that depend on the number of nodes connected by the LoRa gateway?

Answer: the number of nodes connected by the LoRa gateway depends on the availability of the LoRa gatewayChannel resourcesAnd the channel resources occupied by a single LoRa terminal.If the LoRa gateway uses the Semtech standard reference design and the gateway uses the SX1301 chip, the number of channels is fixed.1 downlink channels of 8 uplink channels. The number of physical channels is determined, and the channel resources that the LoRa gateway can provide is also determined.

Channel resources and terminals occupied by a single LoRa terminalOccupancy channelThe time is consistent with the terminal.Packet frequency,Packet numberAnd the LoRa terminalSpread spectrum factorRelated closely. When the LoRa terminal's packet frequency and the number of packet bytes increase, the terminal's time of receiving and receiving the channel will increase, and more channel resources are occupied. When the LoRa terminal uses a larger spread spectrum factor, the signal can be transmitted farther, but the cost of passing the unit byte information will take more time.

26. question: what is the LoRa terminal or node?

Answer: the LoRa terminal is a part of the LoRa network, which is usually composed of LoRa modules and sensors. The LoRa terminal can be powered by battery and can be remotely positioned. Each terminal that conforms to the LoRaWAN protocol can communicate directly with a gateway that meets the LoRaWAN, so as to achieve interoperability.

27. question: which ISM band can I use by using LoRa technology?

In theory, you can use any frequency in the 150 MHz to 1 GHz band. However, Semtech's LoRa chips don't use all the sub-GHz bands, but some frequencies outside the commonly used frequency bands (such as 433MHz, 470MHz~510MHz, 780MHz, and commonly used 868MHz and 915MHz in Europe and America) are not well supported. Present in China433MHz,470-510MHz

28. Q: does the LoRa gateway use free frequency band, will it be susceptible to frequency interference?Anti-interference ability depends on the LoRa technology itself characteristic and the design of the gateway LoRa technology itself has super ultra high receiver sensitivity (RSSI) and signal-to-noise ratio (SNR) with our LoRa gateway and LoRa module as an example, the receiving sensitivity at an astonishing - 142 DBM, and super SNR can let gateway and terminal work under the noise threshold of 20 db in addition, the gateway to use frequency hopping technology

Through the pseudo random code sequence, the frequency shift keying is carried out to make the carrier frequency jump and expand the frequency spectrum to prevent the constant frequency interference.

29. question: what is the data transmission rate for LoRa?

Answer: LoRaWAN protocol defines a series of data transmission rates. Different chips can choose different speed ranges. For example, SX1272 supports 0.3-38.4kbps and SX1276 supports 0.018-38.4kbps's rate range.At present, we can achieve the transmission rate of 0.3-37.5kbps.

30. question: is there a limit to the length of data sent or received by the LoRa device?

There are limits to theory.The SX127x series chips have 256 Bytes FIFO, which can be used to launch or receive 256 Bytes.However, it is not at any transmission rate that the load length of the LoRa module can be 256 Bytes. stayIn the case of low transmission rate, it takes a long time to transmit 256 Bytes at a time, which may take a few seconds or even longer, which is not good for anti-interference and interaction. Therefore, it is generally applied to technology.It is suggested that the user divide a long data into several small data for transmission

31. question: what is the rate adaptive (ADR)?

Answer: Adaptive Date Rate (ADR) is a technology that adjusts data transmission rate to ensure reliable data transmission, optimize network performance and expand network capacity. When the node is close to the gateway, the data transmission rate can be faster and the transmission power is lower. At the edge of the link budget, the data transmission rate is slower and the transmission power is higher. The ADR method can adapt to different network structure, support different path loss, maximize the battery life and the overall network capacity of the terminal, and LoRa network can manage the data transmission rate and spreading factor of each terminal as a whole.

32. question: as far as the LoRa device is concerned, what power is the transmit power that its antenna can achieve?

Answer: the power output from the chip pin is + 20 DBM, and the power output through the antenna matching / filtering loss is + 19 DBM + (-) 0.5 dB. Different regions have different regulations on the maximum output power, and the LoRaWAN protocol defines the different output power of different regions in the case of maximizing the li