Hi everyone,
I encountered an issue where the LARA-R6401 module was giving no response during UART communication. After debugging, I found that the problem was due to improper line termination — specifically, the absence of the carriage return character (\r). The LARA-R6401 module expects all AT commands to be terminated with \r for proper interpretation and execution. If the carriage return is missing, the module fails to recognize the command, leading to no response.
To resolve this, ensure that every AT command sent to the module includes the \r character as part of the command string. Properly formatting the commands in this way will establish successful communication and enable the module to respond as expected.