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PLS8 rel. 3 dhcpcd timeout error | Telit Cinterion IoT Developer Community

August 28, 2017 - 10:21am, 1522 views


After updating the PLS8-E module FW to release 3 (rev. 03.015), I've faced some problems trying to use the WWAN/RmNet Interface to access internet.

I hadn't found any problem before following the procedure given in the "AN39: USB Interface Description" document with rel. 2 but, after updating, I find now that the DHCP server (dhcpcd) returns timeout error on some ocassions, when asking for IP address. It doesn't happen all the time, but just in concrete situations, commonly after a RAT change. It can be working fine in 3G but then, after registering with 4G and trying to get an IP again, it fails. Retrying to call dhcpcd doesn't help, it always fails until a network *********** is done.

It has been checked that the module is correctly registered with the network, signal level is fine and even the AT+CGPADDR command returns a valid IP address.

This is the ATI1 response:





A-REVISION 01.000.01

And this is a log of the problem:

2017-08-22 10:30:56.241953  [DEBUG] [GSM] COMMAND: AT^SMONI=255 (length = 12)

2017-08-22 10:30:56.263215  [DEBUG] [GSM] Command sent. Result: ^SMONI: 4G,1849,3,20,20,FDD,214,03,1BBC,493F90C,68,43,-86,-6,NOCONN

2017-08-22 10:30:56.511804  [DEBUG] [GSM] COMMAND: AT+CREG? (length = 8)

2017-08-22 10:30:56.530276  [DEBUG] [GSM] Command sent. Result: +CREG: 1,1

2017-08-22 10:30:56.781817  [DEBUG] [GSM] COMMAND: AT+COPS? (length = 8)

2017-08-22 10:30:56.792792  [DEBUG] [GSM] Command sent. Result: +COPS: 0,2,"21403",7

2017-08-22 10:30:57.041830  [DEBUG] [GSM] COMMAND: AT+CSQ (length = 6)

2017-08-22 10:30:57.058462  [DEBUG] [GSM] Command sent. Result: +CSQ: 24,99

2017-08-22 10:30:58.252127  [DEBUG] [GSM] COMMAND: AT+CGPADDR=1 (length = 12)

2017-08-22 10:30:58.269890  [DEBUG] [GSM] Command sent. Result: +CGPADDR: 1,""

2017-08-22 10:30:58.273182  [INFO] [GSM] Start WWAN interface: ifconfig usb0 up 2>&1

2017-08-22 10:30:58.512002  [INFO] [GSM] Starting DHCP for WWAN interface: dhcpcd usb0 2>&1

2017-08-22 10:31:36.650657  [ERROR] [GSM] DHCP timed out

This just happens with rel.3 module version, everything else is exactly the same between tests, so it might be a FW issue.

Does anyone know how to solve it?

Thanks in advance. Regards,

Raúl Suárez.