Citizen CL-E321

CITIZEN Android Label Print SDK — Programming Manual
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Return value
Returns CLS_SUCCESS (0) on success, an error code otherwise. See below for the error codes.
"2.1 Return value" describes all error codes.
Error code
Description
CLS_E_CONNECTED (1001)
The printer is already connected.
CLS_E_NOTCONNECT (1003)
Failed to connec to the printer.
(1) The printer is not connected.
(2) The printer is not turned on.
(3) The port handle could not be obtained.
CLS_E_CONNECT_NOTFOUND (1004)
Failed to confirm if the printer is a supported model.
(1) The printer model is not supported.
CLS_E_NOCONTEXT (1006)
No context is specified.
CLS_E_BT_DISABLE (1007)
The Bluetooth device setting is invalid.
CLS_E_BT_NODEVICE (1008)
The Bluetooth device is not found.
Example
printer.connect(LabelConst.CLS_PORT_WiFi, "192.168.129.130");
printer.connect(LabelConst.CLS_PORT_Bluetooth, "");
UsbDevice usbDevice = null;
printer.connect(LabelConst.CLS_PORT_USB, usbDevice);