I am using SARA-U201. I am having problem understanding the timeout for +UDWNFILE file. According to the datasheet (UBX-13002752 - R55, Page 484 of 851, section 21.2 Download file +UDWNFILE) the response time for this command (">" sign ) is immediate:
I have noticed however that this is not entirelly true. I have noticed some delays when using the m-center program through USB, as well as using uart with the interfacing MCU. Here is an example log from my program (Uart2 is the uart peripheral connected to the SARA chip from my MCU):
[17:39:49:032] [2018-02-08T16:39:48.717Z][tNm ]<Debug>: ACK timeout for cmd UDWNFILE(23) set to 7 s
[17:39:49:040] [2018-02-08T16:39:48.725Z][tUartRx ]<Debug>: UART2 RECV(01): 0A
[17:39:49:048] [2018-02-08T16:39:48.733Z][tUartTx ]<Debug>: UART2 SENT(69): 41 54 2B 55 44 57 4E 46 49 4C 45 3D 22 6A 73 6F 6E 5F 32 30 31 38 2D 30 32 2D 30 38...
[17:39:55:980] [2018-02-08T16:39:55.674Z][tNm ]<Error>: Sara message response timeout (7000 ms)
[17:39:55:988] [2018-02-08T16:39:55.674Z][tNm ]<Critical>: Fs: failed to start file entry for json_2018-02-08T188.8.131.528Z_P6W462 08-002D0028-0
[17:39:57:148] [2018-02-08T16:39:56.843Z][tUartRx ]<Debug>: UART2 RECV(02): 0A 3E
[17:39:57:155] [2018-02-08T16:39:56.843Z][tUartRx ]<Debug>: Sara recv file entry: >
[17:40:17:282] [2018-02-08T16:40:16.980Z][tUartRx ]<Debug>: UART2 RECV(09): 0D 0A 45 52 52 4F 52 0D 0A
[17:40:17:289] [2018-02-08T16:40:16.980Z][tUartRx ]<Debug>: Sara recv frc: ERROR
As you can see I was waiting for the response for 7 seconds, but it came after 8,115 seconds. Is the response time for this command somehow altered?
I would appreciate all help regarding this.