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--- wiki:scan [2018/08/23 11:25]
ghi [Example]
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-====== Radio scanning =======
-===== Boot Noise Measurment =====
-The ''BNM'', which stand for Boot Noise Measurement, initiates a spectral scan at startup.
-==== The BNM files ====
-<code>
-/
-├── etc
-│   ├── bnm
-│   │   ├── bnm-868.conf                           # The board configuration file.
-│   │   │
-│   │   └── bnm.conf                               # The global configuration file.
-│   │
-│   ├── init.d
-│   │   └── bnm                                    # The startup script.
-│   │
-│   └── rc5.d
-│       └── S55bnm -> ../init.d/bnm                # The BNM is started whith runlevel 5.
-│
-├── usr
-│   ├── bin
-│   │   └── klk_spectral_scan                      # The utility which run the spectral scan.
-│   │
-│   └── share
-│       └── bnm
-│           ├── bnm-868.conf                       # The default board configuration files.
-│           ├── bnm-915.conf                       # These files define the min and max frequencies
-│           ├── bnm-923.conf                       # to scan.
-│           │
-│           └── klk-loraloc-v1.0.6.kbin            # The needed loraloc firmware.
-│
-└── var
-    ├── backups
-    │   └── bnm
-    │       ├── bnm.0.tar.gz                       # The backup files. Every output files are included
-    │       └── bnm.1.tar.gz                       # in these files. Backup files are rotated by size.
-    └── log
-        └── bnm
-            ├── bnm_slot1_radio1_180219155423.csv  # The last output files. There is one for each slot
-            └── bnm_slot1_radio2_180219155423.csv  # and for each radio.
-</code>
-==== Configure BNM ====
-These parameters can be changed by the user in the global configuration file ''/etc/bnm/bnm.conf''.
-The BNM feature takes some time when the gateway is booting. To avoid Boot Noise Measurement, disable it in this file (Set ''disable'' in the field ''BNM_ENABLE''). \\
-The default configuration is the following.
-<file bash bnm.conf>
-# BNM is executed at boot.
-BNM_ENABLE="enable"
-# Radio configuration.
-STEP_FREQ_MHZ=1
-BANDWIDTH_HZ=62500
-BITRATE_BPS=600
-RADIO_NB="1 2"
-# Number of samples by frequency.
-SAMPLES_NB=20
-# Additional arguments for klk_spectral_scan.
-ADDITIONAL_ARGS="--strip-zero"
-# Number of seconds before scans timeout.
-TIMEOUT_SEC=90
-# Backup size in bytes.
-BACKUP_SIZE=102400
-</file>
-The start frequency and the stop frequency are defined in the default board configuration file. The board configuration file name changes according to the region.
-<file bash bnm-868.conf>
-# Radio configuration.
-START_FREQ_MHZ=853
-STOP_FREQ_MHZ=883
-</file>
-==== Example ====
-=== The BNM is launched at startup ===
-<code>
-Starting BNM... done
-Starting ifplugd: done
-Starting Status manager
-Starting System manager
-Starting Time manager
-Starting SMS manager
-Starting Lighttpd Web Server: lighttpd.
-Starting MonitStarting Monit 5.20.0 daemon with http interface at [localhost]:2812
-.
-Starting network management services: snmpd.
-Executing network monitoring daemon...
-Keros (Kerlink OS Distribution) 4.0.2 klk-lpbs-050789 /dev/console
-klk-lpbs-050789 login: root
-</code>
-=== Get the result ===
-The result of the measurement is available in the ''/var/log/bnm/'' folder.
-<code>
-root@klk-lpbs-04018B:/user/rootfs_rw/var/log/bnm # lldrwxr-xr-x 2 root root 4.0K Feb 20 15:41
-.drwxr-xr-x 3 root root 4.0K Feb 20 15:40 ..-rw-r--r-- 1 root root 317 Feb 20 15:41
-bnm_slot2_radio1_180220154120.csv-rw-r--r-- 1 root root 324 Feb 20 15:41
-bnm_slot2_radio2_180220154120.csv-rw-r--r-- 1 root root 331 Feb 20 15:41
-bnm_slot3_radio1_180220154120.csv-rw-r--r-- 1 root root 352 Feb 20 15:41
-bnm_slot3_radio2_180220154120.csv-rw-r--r-- 1 root root 337 Feb 20 15:41
-bnm_slot4_radio1_180220154120.csv-rw-r--r-- 1 root root 322 Feb 20 15:41
-</code>
-In this example, three LoRa modules are connected. For each LoRa module the spectral scan is done for the channel 1 and for the channel 2.
-<code>
-bnm_slot2_radio1_180220154120.csv-rw-r--r-- 1 root root 324 Feb 20 15:41
-</code>
-=== Interpret the result ===
-This file is the result of the spectral scan analysis on the LoRa module located in slot 2 and for the radio channel 1. \\
-The default configuration uses frequency steps of 1MHz on a 62500Hz bandwidth. \\
-For each frequency, 20 samples are taken. For 868 MHz gateway, the start frequency is 863 MHz and the stop frequency 873 MHz.
-Thus 220 samples are measured. Former measurements are backuped in the directory ''/user/rootfs_rw/var/backups/bnm''.
-<code>
-root@klk-lpbs-04018B:/user/rootfs_rw/var/log/bnm # cat bnm_slot2_radio1_180220154120.csv
-863000000,-125,4,-124,15,-123,1
-864000000,-115,3,-114,13,-113,4
-865000000,-124,3,-123,17
-866000000,-124,18,-123,2
-867000000,-126,2,-125,7,-124,11
-868000000,-126,14,-125,6
-869000000,-127,1,-126,12,-125,6,-124,1
-870000000,-127,1,-126,14,-125,5
-871000000,-126,18,-125,2
-872000000,-127,3,-126,17
-873000000,-127,8,-126,12
-root@klk-lpbs-04018B:/user/rootfs_rw/var/log/bnm #
-</code>
-In the above result 20 measures has been done for 863 MHz frequency. 4 times the result was -125 dBm, 15 times -124 dBm and 1 time -123 dBm.
-==== Known issues ====
-The number of steps is limited to 255. Mind that the step number must be below that limit. Ajustments are possible by configuring ''START_FREQ_MHZ'', ''STOP_FREQ_MHZ'' and ''STEP_FREQ_MHZ''.
-<ifauth @admin,@klk>
-===== Manuel radio scanning =====
-LOC modules (used to send/receive LoRa RF) contain a chip (sx1239) used as a radio scanner.
-To use this radio scanner, the first step is to connect to the sx1239 through the ''microcom'' serial terminal.
-The path of the sx1239 can be retrieved in the ''/tmp/sys_startup_status.json'' json file in the ''acm_path'' field. Depending of the gateway used, up to 4 paths can be present on it.
-<code bash>
-$ grep acm_path /tmp/sys_startup_status.json
-"acm_path": "/dev/slot/2/ttyACM",
-"acm_path": "/dev/slot/3/ttyACM",
-</code>
-Once the slot of a modem is identified, the serial port can be opened with the ''microcom'' command, with one of the previously displayed paths as parameter. To log the traces of the ''microcom'' command, a pipe to the ''tee'' command is used.
-<code bash>
-$ microcom /dev/slot/2/ttyACM | tee /tmp/spectral_scan.log
-</code>
-The command to start a spectrum scanning is ''sx1239'', with the following parameters:
-  * scan mode: need to be fl
-  * number of paths: need to be 1 for Lora Dual modem
-  * start frequency in Hertz
-  * stop frequency in Hertz (a maximum bandwidth of 15MHz between the start and stop frequencies can be used)
-  * frequency step in Hertz (should be 62500)
-  * frequency bandwidth in Hertz (should be 62500)
-  * bitrate (should be 600)
-  * loop number, set to 0 for an infinite scanning
-<code bash>
-$ sx1239 fl 1 863000000 865000000 62500 62500 600 10
-:0:7C7C7B7B7B7C7C7A7B7B7A7B7B7B7B7B797B7A7A7B7A7A7A7A7A7A7B7C7B7B7B7B
-:216:7C7B7C7B7C7C7B7B7B7B7B7B7B7B7B7A747B7B7A7A7B7B7A7A7A7A7A7A7B7B7A7A
-:216:7B7C7B7B7B7B7B7B7B7B7B7B7B7A7B7B7A7A7A7A7A7A7A7A7A7A7A7B7A7B7B7B7B
-:216:7B7B7B7A7B7C7B7B7B7B7A7B7A7B7C7B757A7A7B7A7A7B7A7A7A7A7B7B7B7B7B7C
-:216:7B7B7B7C7C7B7C7A7B7B7B7B7B7C7A7B7A7B7B7A7B7A7A7A7A7A7A7A7A7A7B7A7B
-:216:7B7C7B7B7B7B7B7A7B7B7B7A7B7B7B7B777A7A7B7B7B7B7B7A7A7A7A7A7A7A7B7B
-:216:7B7B7B7B7B7B7C7B7B7B7A7B7B7C7B7B767A7A7A7B7A7A7A7A7A7B7A7B7A7C7B7B
-:216:7B7C7B7B7C7B7B7B7B7B7B7B7C7A7B7B767A7B7B7B7A7A7A7A7A7A7B7B7A7B7B7A
-:216:7C7C7B7C7B7B7C7B7B7C7B7B7A7B7B7B777A7A7B7A7A7A7B7B7A7B7B7B7A7B7B7B
-:216:7B7A7A7B7C7C7C7A7B7B7C7C7B7A7A7B797B7A7B7C7A7A7A7B7A7B7A7A7A7A7A7B
-#press ctrl+x to exit microcom
-</code>
-The spectrum data are returned line by line. Each line corresponds to a complete scan of the band. The format is ASCII and respects the following protocol:
-<code>
-[PATH] : [DURATION] : [DATA] [END]
-</code>
-Where :
-  * [PATH] : radio path number : 0 or 1 (always 0 for Lora Dual modem)
-  * [DURATION] : duration of the scan of the full band expressed in milli-seconds coded as a decimal
-  * [DATA] : N x data coded as hexascii between 00 and FF, it expresses the opposite of the received power (-RSSI)
-  * [END] : synchro character: \r\n (0x0D 0x0A)
-The following command is an example of how to convert the raw data contained in the ''spectral_scan.log'' file to decimal RSSI values in dBm. (it requires gawk, therefore, it cannot be directly used on the Wirnet™ iBTS)
-<code bash>
-$ grep "0:" spectral_scan.log | sed 's/^[\0-9]:[0-9]*://g' | sed 's/.\{2\}/& /g' | awk --non-decimal-data '{for(i=1;i<=NF;i++) $i=sprintf("%d","0x"$i)}1' | sed 's/\([0-9]\+\)/-\1/g'
--124 -124 -123 -123 -123 -124 -124 -122 -123 -123 -122 -123 -123 -123 -123 -123 -121 -123 -122 -122 -123 -122 -122 -122 -122 -122 -122 -123 -124 -123 -123 -123 -123
--124 -123 -124 -123 -124 -124 -123 -123 -123 -123 -123 -123 -123 -123 -123 -122 -116 -123 -123 -122 -122 -123 -123 -122 -122 -122 -122 -122 -122 -123 -123 -122 -122
--123 -124 -123 -123 -123 -123 -123 -123 -123 -123 -123 -123 -123 -122 -123 -123 -122 -122 -122 -122 -122 -122 -122 -122 -122 -122 -122 -123 -122 -123 -123 -123 -123
--123 -123 -123 -122 -123 -124 -123 -123 -123 -123 -122 -123 -122 -123 -124 -123 -117 -122 -122 -123 -122 -122 -123 -122 -122 -122 -122 -123 -123 -123 -123 -123 -124
--123 -123 -123 -124 -124 -123 -124 -122 -123 -123 -123 -123 -123 -124 -122 -123 -122 -123 -123 -122 -123 -122 -122 -122 -122 -122 -122 -122 -122 -122 -123 -122 -123
--123 -124 -123 -123 -123 -123 -123 -122 -123 -123 -123 -122 -123 -123 -123 -123 -119 -122 -122 -123 -123 -123 -123 -123 -122 -122 -122 -122 -122 -122 -122 -123 -123
--123 -123 -123 -123 -123 -123 -124 -123 -123 -123 -122 -123 -123 -124 -123 -123 -118 -122 -122 -122 -123 -122 -122 -122 -122 -122 -123 -122 -123 -122 -124 -123 -123
--123 -124 -123 -123 -124 -123 -123 -123 -123 -123 -123 -123 -124 -122 -123 -123 -118 -122 -123 -123 -123 -122 -122 -122 -122 -122 -122 -123 -123 -122 -123 -123 -122
--124 -124 -123 -124 -123 -123 -124 -123 -123 -124 -123 -123 -122 -123 -123 -123 -119 -122 -122 -123 -122 -122 -122 -123 -123 -122 -123 -123 -123 -122 -123 -123 -123
--123 -122 -122 -123 -124 -124 -124 -122 -123 -123 -124 -124 -123 -122 -122 -123 -121 -123 -122 -123 -124 -122 -122 -122 -123 -122 -123 -122 -122 -122 -122 -122 -123
-</code>
-</ifauth>

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