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Command Not Executing When Initiating Sale in Android USB Serial Communication

I’m building an Android app that communicates with a USB serial device (a Verifone C200) using the com.github.felHR85:UsbSerial library. The app attempts to send a sale initiation command to the device when the user presses a button, but the command isn’t being executed as expected. Below is the full code for my MainActivity and related classes:

Command Not Executing When Initiating Sale in Android USB Serial Communication

I’m building an Android app that communicates with a USB serial device (a Verifone C200) using the com.github.felHR85:UsbSerial library. The app attempts to send a sale initiation command to the device when the user presses a button, but the command isn’t being executed as expected. Below is the full code for my MainActivity and related classes:

Command Not Executing When Initiating Sale in Android USB Serial Communication

I’m building an Android app that communicates with a USB serial device (a Verifone C200) using the com.github.felHR85:UsbSerial library. The app attempts to send a sale initiation command to the device when the user presses a button, but the command isn’t being executed as expected. Below is the full code for my MainActivity and related classes: