LoRaWAN

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== Overview ==
 
== 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>
 
<br><br>
第6行： 第107行：
  
 
https://www.thethingsnetwork.org/docs/lorawan/address-space.html
 
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>
 
<br>
第11行： 第189行：
 
== Reference ==
 
== 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.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 ]
 
* [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://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>
 
<br><br>
 
<br><br>
 
<br><br>

2020年12月25日 (五) 16:04的最后版本

目录

[编辑] 1 Overview

https://www.thethingsnetwork.org/docs/lorawan/

详解LoRaWAN协议



[编辑] 2 基本设置

[编辑] 2.1 Overview

  • SF_12
  • BW_125 (125KHz)
  • CR_5 (CR 4/5)
  • Explicit Header
  • CRC_ON

Sx1278-signal-bandwidth.png


[编辑] 2.2 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： 

......
^$Get Preamble Length: state 0
^$Preamble Length: 8
......


[编辑] 2.3 Sync word

  • 0x12 by default
  • 0x34 for LoRaWAN

相关寄存器：RegSyncWord


[编辑] 2.4 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



[编辑] 2.5 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



[编辑] 3 Address

https://www.thethingsnetwork.org/docs/lorawan/address-space.html


[编辑] 4 Gateway Traffic

uplink, downlink, join 

Time    Frequency    Mod.    CR    Data Rate    Airtime (ms)    cnt


[编辑] 5 Gateway Test 

$ ./lora_gateway -d 5 -e 12 -c 125 -i 34 -h 2 -f -g 434.3


[编辑] 6 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 
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.

Refer to: Basic Config 

$ sudo apt-get install jq
$ sudo apt-get install python-pip
$ sudo apt-get install python-dateutil python-crypto


[编辑] 7 Reference








来自“http://wiki.jackslab.org/index.php?title=LoRaWAN&oldid=14245”
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