RN-42 bluetoothモジュール

なにこれ？

• Bluetooth-USBシリアル通信モジュール
• Bluetoothのシリアル通信プロトコルでBluetoothデバイスと通信
• USBも備えていて、ttyデバイスとして見える。
• 2台1組で使うと、シリアル通信ケーブルを無線化できる。

USB側の動作確認

1. USBケーブルをデバイスとつなぐ（2Hzで緑LED点滅）
2. ls /devでttyUSBnが見える（nは数字、以降0とする)
3. sudo screen /dev/ttyUSB0 115200でターミナルにつなげる
4. $$$とキーボードから入力するとCMDという文字が出る(10Hzで緑LED点滅)
5. D<Enter>を押すとデバイスの情報がでる

***Settings***
BTA=11:11:11:11:11:11
BTName=RNBT-XXXX
Baudrt(SW4)=115K
Mode  =Slav
Authen=1
PinCod=<pin code>
Bonded=0
Rem=NONE SET

1. ---<Enter>と入力してデータ通信モードに戻る(ENDという文字が出て、2Hzで緑LED点滅)

動作確認完了

BT側接続

1. ペアリング

$ bluetoothctl 
[NEW] Controller 11:11:11:11:11:11 mymachine [default]
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# scan on
Discovery started
[CHG] Controller 11:11:11:11:11:11 Discovering: yes
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 
[NEW] Device 11:11:11:11:11:11 
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 11-11-11-11-11-11
[NEW] Device 11:11:11:11:11:11 
[NEW] Device 11:11:11:11:11:11 RNBT-XXXX  # ←これ
[NEW] Device 11:11:11:11:11:11 
[bluetooth]# info 11:11:11:11:11:11
Device 11:11:11:11:11:11
    Name: RNBT-XXXX
    Alias: RNBT-XXXX
    Class: 0x001f00
    Paired: no
    Trusted: no
    Blocked: no
    Connected: no
    LegacyPairing: no
    RSSI: -44
[bluetooth]# pair 11:11:11:11:11:11
Attempting to pair with 11:11:11:11:11:11
[CHG] Device 11:11:11:11:11:11 Connected: yes
[CHG] Device 11:11:11:11:11:11 UUIDs: 00001101-0000-1000-8000-00000000
[CHG] Device 11:11:11:11:11:11 Paired: yes
Pairing successful
[CHG] Device 11:11:11:11:11:11 Connected: no
[bluetooth]# exit

1. ttyデバイスの作成

sudo rfcomm bind 0 <mac address>で/dev/rfcomm0があることを確認する.

1. シリアルデバイスとして接続

sudo screen /dev/rfcomm0 115200`