string CmdHex(string cmdAsHex, string uidHex = null, int timeoutMs = 1000, string deviceName = null)
Sends and recieves data to/from the device. Trust Level Required: High
Parameters
| Name | Description |
| cmdAsHex | This string may be formatted with spaces in between bytes if desired, and is not case-sensitive. Both are valid: '8F2c' '8f 2C'. |
| uidHex | The UID in hexadecimal format. |
| timeoutMs | If 0, OnKioDeviceResult will be called in every browser/frame with the return bytes as a hex string. Otherwise, the bytes are returned immediately. |
| deviceName | The name of the device. |
Return
Data, or null on failure.
