The device may go into sleep mode. Please pull the LP_MODE pin to high and test again.
When device will go into sleep mode. Because from I testing, I think it is easily no command response.
My test step:
1. Boot ind
2. Send "/QFV\r\n" command, but no response. If I continue to send this command, it will have the command response sometimes.
And I check the document, system_get_sleep_parameters API default value is 0 = Sleep disabled (factory default)
Is there other way to let device don't go into sleep mode(Not modify hardware with LP_mode pin) such as use releated API command?
Please pull high or down with LP_MODE pin. In the user guide, there is a note for this pin: "Note: LP_MODE should be not left floating. Otherwise, firmware will exhibit unexpected behavior."