はじめまして。
CANDY Pi Lite LTE-Mをセットアップして低速通信はできるようになりましたが、USB接続を利用した通信ができません。
実行環境は：
機種: Raspberry Pi 3 Model B+ Rev 1.3
OS: Raspbian Buster 10.6
です。
低速通信ができることを確認した後、
sudo candy service stop
でサービス停止して、
https://candy-line.gitbooks.io/candy-pi-lite/content/setup/usb.html
にあるように拡張ボードにUSBケーブルを挿してラズパイを再起動しました。
このとき
sudo candy service status
と入力すると、
● candy-pi-lite.service - CANDY Pi Lite Service, version:10.2.1 Loaded: loaded (/lib/systemd/system/candy-pi-lite.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2020-11-18 14:00:03 JST; 36s ago Main PID: 559 (bash) Tasks: 2 (limit: 2063) CGroup: /system.slice/candy-pi-lite.service ├─ 559 bash /opt/candy-line/candy-pi-lite/start_systemd.sh └─1100 python3 -c import candy_board_qws; print(candy_board_qws.SerialPort.resolve_modem_port(115200)) Nov 18 14:00:33 raspberrypi candy-pi-lite[1062]: [INFO] Looking for a Modem Serial port at Barudrate: 460800... Nov 18 14:00:33 raspberrypi candy-pi-lite[1067]: [INFO] Result: /dev/ttySC1 Nov 18 14:00:34 raspberrypi candy-pi-lite[1070]: [INFO] Looking for a Modem Serial port at Barudrate: 115200... Nov 18 14:00:35 raspberrypi candy-pi-lite[1076]: [INFO] Looking for a Modem Serial port at Barudrate: 460800... Nov 18 14:00:36 raspberrypi candy-pi-lite[1080]: [INFO] Result: /dev/ttySC1 Nov 18 14:00:37 raspberrypi candy-pi-lite[1083]: [INFO] Looking for a Modem Serial port at Barudrate: 115200... Nov 18 14:00:38 raspberrypi candy-pi-lite[1091]: [INFO] Result: None Nov 18 14:00:38 raspberrypi candy-pi-lite[1092]: [INFO] Looking for a Modem Serial port at Barudrate: 460800... Nov 18 14:00:38 raspberrypi candy-pi-lite[1096]: [INFO] Result: /dev/ttySC1 Nov 18 14:00:39 raspberrypi candy-pi-lite[1099]: [INFO] Looking for a Modem Serial port at Barudrate: 115200...
と表示されていて、Activeではあるものの
sudo candy network show
と入力すると、
[ERROR] CANDY Board Service isn't running
と返ってきて、サービスが機能していないように見えます。
ログを確認するため、
sudo journalctl -u candy-pi-lite -o cat
と入力すると、
Started CANDY Pi Lite Service, version:10.2.1.
[INFO] Initializing CANDY Pi Lite Board…
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Modem Serial port: /dev/ttySC1 and AT Serial port: /dev/ttySC1 are selected
[INFO] Initializing modem with baudrate:460800
[INFO] Initialization Done. Modem Serial Port => /dev/ttySC1 Modem baudrate => 460800
[INFO] SIM card state => SIM_STATE_READY
[INFO] USB Serial Ports are found => /dev/QWS.BG96.MODEM, /dev/QWS.BG96.AT
[INFO] New USB serial ports are detected
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Result: None
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
[INFO] Result: /dev/ttySC1
[INFO] Looking for a Modem Serial port at Barudrate: 115200…
[INFO] Looking for a Modem Serial port at Barudrate: 460800…
（以下省略）
と、モデムのシリアルポートを探索し続けます。
どのようにすればUSB接続できるでしょうか。ご教授いただけると幸いです。