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== Overview == https://www.thethingsnetwork.org/docs/lorawan/ [http://murata.eetrend.com/article/2018-09/1002060.html 详解LoRaWAN协议] <br><br> == 基本设置 == === Overview === * SF_12 * BW_125 (125KHz) * CR_5 (CR 4/5) * Explicit Header * CRC_ON [[文件:Sx1278-signal-bandwidth.png]] <br> === Preamble === LoRa 数据包前导码,用于接收机辩识 rx data flow。内容固定,长度可选。 默认 12 个 symbol(Bytes?), 0x8 (RegPreambleLsb) + 4 可写 RegPreambleMsb 和 RegPreambleLsb 这两个寄存器,将其改为 6 +4 ~ 65535 +4 10 symbol 的短前导码,通信够用但具有更短的接收周期。。。 当前系统一般皆适用 12 (4 + 8) 的长度: <source lang=bash> ...... ^$Get Preamble Length: state 0 ^$Preamble Length: 8 ...... </source> <br> === Sync word === * 0x12 by default * 0x34 for LoRaWAN 相关寄存器:RegSyncWord <br> === Header === Explicit Header & Implicit Header 可通过寄存器 RegModemConfig1 内的位 ImplicitHeaderModeOn 来控制 '''Explicit Header:''' Reset 默认的模式。其能提供的信息: * Payload 长度 * The forward error correction code rate * The presence of an optional 16-bits CRC for the payload The head is transmitted with maximum error correction code (4/8). It also has its own CRC to allow the receiver to discard invalid headers. '''Implicit Header:''' Header is removed from the LoRa Packet. Payload, Coding Rate and CRC presence are fixed. Be advantageous to reduce transmission time <br><br> === CRC === RegPayloadCrcOn: RegModemConfig2[2:2] * 0 ---> CRC disable * 1 ---> CRC enable In Implicit Header Mode: must be set on Tx and Rx side In Explicit Header Mode: on the Tx side alone (recovered from the header in Rx side) '''Explicit Header Mode Checking process:''' Rx 用户负责检查 CrcOnPayload (RegHopChannel[6:6], CRC information extracted from the rx packet header) 如果 CrcOnPayload == 1,需要检查 IRQ 标志位 PayloadCrcError,以确保没有 CRC 错误 '''Implicit Header Mode 则直接去检查 IRQ 标志位 PayloadCrcError,以确保没有 CRC 错误''' <br><br> == Address == https://www.thethingsnetwork.org/docs/lorawan/address-space.html <br> == Gateway Traffic == uplink, downlink, join <source lang=bash> Time Frequency Mod. CR Data Rate Airtime (ms) cnt </source> <br> == Gateway Test == <source lang=bash> $ ./lora_gateway -d 5 -e 12 -c 125 -i 34 -h 2 -f -g 434.3 </source> <br> == Gateway Config == '''basic_config_gw.sh:''' * 生成 gateway_id.txt, gateway_id.md5 * 生成配置文件 gateway_conf.json * 配置 WiFi * 把 start_gw.sh 加到系统自启动脚本 /etc/rc.local 中 * 编译 lora_gateway <source lang=bash> pi@raspberrypi:~/lora-gw/gw_full_latest $ ./scripts/test_gwid.sh Detecting gw id as 0000B827EF8855AA pi@raspberrypi:~/lora_gateway $ scripts/basic_config_gw.sh MKB827EF8855AA00 Taking provided address: MKB827EB8E763900 Keep a copy of /home/pi/lora_gateway/scripts/update_gw.sh mkdir: cannot create directory ‘/home/pi/scripts’: File exists Done Creating /home/pi/lora_gateway/gateway_id.txt file Writing 0000MKB827EF8855AA00 Done Creating /home/pi/lora_gateway/gateway_id.md5 file Done Replacing gw id in /home/pi/lora_gateway/gateway_conf.json Done Creating /home/pi/Dropbox/LoRa-test Done Creating log -> /home/pi/Dropbox/LoRa-test Done Setting gateway to run at boot Removing /home/pi/lora_gateway/scripts/start_gw.sh in /etc/rc.local if any Done Add /home/pi/lora_gateway/scripts/start_gw.sh in /etc/rc.local Done Compile lora_gateway executable ~/lora_gateway ~/lora_gateway rm *.o lora_*gateway You have a Raspberry 1 Compiling for Raspberry 1 g++ -DPABOOST -DMAX_DBM=20 -DRASPBERRY -DIS_RCV_GATEWAY -c lora_gateway.cpp -o lora_gateway.o g++ -c arduPi.cpp -o arduPi.o g++ -c SX1272.cpp -o SX1272.o g++ -lrt -lpthread lora_gateway.o arduPi.o SX1272.o -o lora_gateway ~/lora_gateway You should reboot your Raspberry Bye. </source> Refer to: [https://github.com/CongducPham/LowCostLoRaGw/tree/master/gw_full_latest#configure-your-gateway-with-basic_config_gwsh-or-config_gwsh Basic Config] <source lang=bash> $ sudo apt-get install jq $ sudo apt-get install python-pip $ sudo apt-get install python-dateutil python-crypto </source> <br> == Reference == * [[SX127x]] * [[SX126x]] * [[LoRa]] * [http://www.yidianzixun.com/article/0I1kkv1O?title_sn/0&s=3&appid=xiaomi&ver=4.5.5.0&utk=2tr9mcf3 LoRa要替代NB-IoT?470-510MHz背后的玄机] * [http://www.sohu.com/a/215495722_114815 更正说明:470-510MHz为授权频段 ] * [https://baijiahao.baidu.com/s?id=1589115634160657203&wfr=spider&for=pc 一份征求意见稿 一片争议声 LoRa你现在还好吗?] * https://blog.csdn.net/wang2425559/article/details/74929743 * https://github.com/CongducPham/LowCostLoRaGw/blob/master/gw_full_latest/README-NewCloud.md <br><br> <br><br> <br><br>
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