LoRa Gateway 笔记 3.1.3 帮助程序 util_pkt_logger 进行 LoRa 空口抓包

twowinter

发布于 2020-04-17 12:23:14

9880

发布于 2020-04-17 12:23:14

文章被收录于专栏：twowinter

文章目录

- [前言](https://cloud.tencent.com/developer/audit/support-plan/8886524#_2)
- [1 对 LoRaWAN 节点进行抓包](https://cloud.tencent.com/developer/audit/support-plan/8886524#1__LoRaWAN__10)
- [2 监听其他 LoRa 网关的下行包](https://cloud.tencent.com/developer/audit/support-plan/8886524#2__LoRa__44)
- [3 监听 未使能CRC 的数据包](https://cloud.tencent.com/developer/audit/support-plan/8886524#3__CRC__75)
- [END](https://cloud.tencent.com/developer/audit/support-plan/8886524#END_84)

前言

以前小能手使用 SX1276 做过一个 LoRa抓包工具，最大的局限是不能抓多个频点的数据。而 LoRaGateway 的帮助程序 util_pkt_logger 就提供了这个现成的功能，使用 SX1301 可以同时监听至少8路信道。

本文在 Semtech AE 的帮助下，成功完成了对网关下行空口的监听，于是做个记录，可能会帮助到有需要的朋友。

小能手整理了 LoRa Gateway 的开发笔记系列，详细可点此查看。

1 对 LoRaWAN 节点进行抓包

进入 \lora_gateway\util_pkt_logger 目录，直接 make clean all，即可完成编译操作。

在调整完 global_conf.json 的频点配置之后即可进行抓包，数据包会被写入到日志文件中。默认可抓取 LoRaWAN 节点的上行数据包。

pi@ttn-gateway:/opt/ttn-gateway/lora_gateway $ cd util_pkt_logger/
pi@ttn-gateway:/opt/ttn-gateway/lora_gateway/util_pkt_logger $ ./util_pkt_logger 
loragw_pkt_logger: INFO: found global configuration file global_conf.json, trying to parse it
loragw_pkt_logger: INFO: global_conf.json does contain a JSON object named SX1301_conf, parsing SX1301 parameters
loragw_pkt_logger: INFO: lorawan_public 1, clksrc 1
loragw_pkt_logger: INFO: radio 0 enabled (type SX1255), center frequency 500700000, RSSI offset -176.000000, tx enabled 0, tx_notch_freq 0
loragw_pkt_logger: INFO: radio 1 enabled (type SX1255), center frequency 501500000, RSSI offset -176.000000, tx enabled 0, tx_notch_freq 0
loragw_pkt_logger: INFO: LoRa multi-SF channel 0 enabled, radio 0 selected, IF -400000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 1 enabled, radio 0 selected, IF -200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 2 enabled, radio 0 selected, IF 0 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 3 enabled, radio 0 selected, IF 200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 4 enabled, radio 1 selected, IF -400000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 5 enabled, radio 1 selected, IF -200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 6 enabled, radio 1 selected, IF 0 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 7 enabled, radio 1 selected, IF 200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa standard channel 8 disabled
loragw_pkt_logger: INFO: FSK channel 8 disabled
loragw_pkt_logger: INFO: global_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
loragw_pkt_logger: INFO: gateway MAC address is configured to AA555A0000000000
loragw_pkt_logger: INFO: found local configuration file local_conf.json, trying to parse it
loragw_pkt_logger: INFO: local_conf.json does not contain a JSON object named SX1301_conf
loragw_pkt_logger: INFO: local_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
loragw_pkt_logger: INFO: gateway MAC address is configured to AA555A0000000101
loragw_pkt_logger: INFO: concentrator started, packet can now be received
loragw_pkt_logger: INFO: Now writing to log file pktlog_AA555A0000000101_20190513T092441Z.csv

2 监听其他 LoRa 网关的下行包

默认情况 util_pkt_logger 运行时 RX I/Q invert 是关闭的，我们要接收其他网关的数据包的就要打开它。

源文件为：\lora_gateway\libloragw\src\loragw_hal.c

void lgw_constant_adjust(void) {

    /* I/Q path setup */
    lgw_reg_w(LGW_MODEM_INVERT_IQ,0); /* default 1 */ 0-enable Rx I/Q invert
}

重新编译后，即可使用。

注意：既要编译 \lora_gateway\libloragw，也要编译 \lora_gateway\util_pkt_logger，以保证能使用到最新的库文件。

抓包日志如下：

pi@ttn-gateway:/opt/ttn-gateway/lora_gateway/util_pkt_logger $ tail -f pktlog_AA555A0000000101_20190513T094616Z.csv 
"gateway ID","node MAC","UTC timestamp","us count","frequency","RF chain","RX chain","status","size","modulation","bandwidth","datarate","coderate","RSSI","SNR","payload"
"AA555A0000000101","","2019-05-13 09:46:22.262Z",   8233788, 500500000,0, 1,"CRC_OK" , 12,"LORA",125000,"SF12"  ,"4/5",-130, +7.2,"60376200-02206701-93113387"
"AA555A0000000101","","2019-05-13 09:46:36.829Z",  22827267, 500500000,0, 1,"CRC_OK" , 43,"LORA",125000,"SF7"   ,"4/5",-133, +3.2,"60C3AA68-E0A00E02-009EA175-EA08A56F-E2BB4581-4AFD453A-17DCA68A-41C729D6-EBBC84A2-724BB81B-717740"
"AA555A0000000101","","2019-05-13 09:46:42.261Z",  28233732, 501500000,1, 6,"CRC_OK" , 12,"LORA",125000,"SF12"  ,"4/5",-133, +3.8,"60376200-02206901-16C1C4C6"
"AA555A0000000101","","2019-05-13 09:46:52.261Z",  38233700, 500900000,0, 3,"CRC_OK" , 12,"LORA",125000,"SF12"  ,"4/5",-125, +6.2,"60376200-02206A01-BE6B087E"
"AA555A0000000101","","2019-05-13 09:47:02.263Z",  48233676, 501700000,1, 7,"CRC_OK" , 12,"LORA",125000,"SF12"  ,"4/5",-136, +2.0,"60376200-02206B01-C7D12879"
"AA555A0000000101","","2019-05-13 09:47:12.263Z",  58234660, 501100000,1, 4,"CRC_OK" , 12,"LORA",125000,"SF12"  ,"4/5",-127, +4.0,"60376200-02206C01-A31BEA2E"

3 监听未使能CRC 的数据包

void lgw_constant_adjust(void) {
    lgw_reg_w(LGW_ONLY_CRC_EN,0);
    lgw_reg_w(LGW_MBWSSF_ONLY_CRC_EN,0);
}

END

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