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u-blox SARA-R412M with cellular PPP #10901

Closed vidavidorra closed 4 years ago

vidavidorra commented 5 years ago

Description

I'm trying to use the u-blox PPP with the u-blox SARA-R412M-02B. The u-blox module is running on firmware version M0.09.00. The latest version is M0.10.00 but in the release notes of that I can't see any relevant changes to going to PPP mode. I'm running on mbed-os-5.11.4, but didn't see significant changes for this in the release notes of later releases. Please let me know if there are significant changes (and which) that can help with this issue.

The issue seems related to #7682, but I also cannot get this working when I manually change AT+CGDATA="PPP",1 to ATD*99***1#. That change is basically using this else-statement. See the log below (when I was using AT+CGDATA but output is the same for the ATD option.

Log

1970-01-01 00:00:00 [3] Starting connection thread, timeout in 360000 ms (submodules/mbed-system/source/wtg_service/wtg_service.cpp:190)
[INFO][CELL]: CellularContext set blocking 0
[INFO][CELL]: CellularContext connect
[DBG ][CELL]: AT OoB readable 1, len 0
[224][DBG ][CELL]: AT OoB done
[INFO][CELL]: Start connecting (timeout 1 s)
AT
[DBG ][CELL]: AT error -3012
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: consume_to_tag not found
[DBG ][CELL]: AT stop tag not found
[DBG ][CELL]: AT error -3012
AT
[DBG ][CELL]: AT error -3012
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: consume_to_tag not found
[DBG ][CELL]: AT stop tag not found
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: Init => Power
[INFO][CELL]: Modem power ON (timeout 1 s)
[DBG ][CELL]: Power => Device ready
[DBG ][CELL]: AT OoB readable 1, len 0
[0][DBG ][CELL]: AT OoB done
[DBG ][CELL]: AT flush
ATE0
[DBG ][CELL]: AT error -3012
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: consume_to_tag not found
[DBG ][CELL]: AT stop tag not found
[DBG ][CELL]: AT error -3012
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: consume_to_tag not found
[DBG ][CELL]: AT stop tag not found
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: Device ready: retry 1/10
[INFO][CELL]: Continue after 2 seconds
[DBG ][CELL]: AT flush
ATE0
ATE0

OK
AT+CMEE=1

OK
[INFO][CELL]: Modem ready
AT+CGMM

SARA-R412M-02B

OK
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: AT error -3012
[WARN][CELL]: AT timeout
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: consume_to_tag not found
[DBG ][CELL]: AT stop tag not found
[DBG ][CELL]: AT error -3012
[DBG ][CELL]: callback: 4096, err: 0, data: -1
[DBG ][CELL]: CellularContext: event 4096, err 0, data -1
1970-01-01 00:00:09 [3] Connection status: 1, cellular status: 1 (submodules/mbed-system/source/connection/network_connection.cpp:173)
[DBG ][CELL]: Device ready => SIM pin
AT+CSQ

+CSQ: 99,99

OK
[INFO][CELL]: RSSI unknown
[INFO][CELL]: Setup SIM (timeout 1 s)
[DBG ][CELL]: AT flush
AT+CPIN?

+CPIN: READY

OK
[INFO][CELL]: SIM is ready
[DBG ][CELL]: callback: 4097, err: 0, data: 0
[DBG ][CELL]: CellularContext: event 4097, err 0, data 0
1970-01-01 00:00:09 [3] Connection status: 1, cellular status: 2 (submodules/mbed-system/source/connection/network_connection.cpp:173)
AT+CGREG=2

OK
AT+CREG=2

OK
AT+CGACT?

+CGACT: 1,1

O[DBG ][CELL]: Found active context
K
[DBG ][CELL]: ACTIVE CONTEXT FOUND, skip registering.
AT+CGATT?

+CGATT: 1

OK
[DBG ][CELL]: DEVICE IS ALREADY ATTACHED TO NETWORK, skip registering and attach.
[INFO][CELL]: Setting the packet domain stuffsies...
[INFO][CELL]: AT_CellularNetwork::set_packet_domain_event_reporting
AT+CGDCONT?

+CGDCONT: 1,"IP","public4.m2minternet.com","XXXXXX",0,0,0,0

OK
AT+CGEREP=1

OK
[DBG ][CELL]: SIM pin => Registering network
AT+CSQ

+CSQ: 99,99

OK
[INFO][CELL]: RSSI unknown
[INFO][CELL]: Network registration (timeout 180 s)
AT+CGREG?

+CGREG: 2,4

O[DBG ][CELL]: +CGREG: RegistrationUnknown, LAC -1, cell -1, RAT unknown
K
AT+CREG?

+CREG: 2,5,"FFFE","19A4201",7

[DBG ][CELL]: +CREG: RegisteredRoaming, LAC 65534, cell 26886657, E_UTRAN
OK
[INFO][CELL]: Roaming network.
[DBG ][CELL]: callback: 4098, err: 0, data: 11
[DBG ][CELL]: CellularContext: event 4098, err 0, data 11
1970-01-01 00:00:10 [3] Connection status: 1, cellular status: 18 (submodules/mbed-system/source/connection/network_connection.cpp:173)
[DBG ][CELL]: Registering network => Attaching network
AT+CSQ

+CSQ: 99,99

OK
[INFO][CELL]: RSSI unknown
[INFO][CELL]: Attaching network (timeout 60 s)
AT+CGATT?

+CGATT: 1

OK
[DBG ][CELL]: callback: 4102, err: 0, data: 1
[DBG ][CELL]: CellularContext: event 4102, err 0, data 1
1970-01-01 00:00:10 [3] Connection status: 1, cellular status: 38 (submodules/mbed-system/source/connection/network_connection.cpp:173)
1970-01-01 00:00:10 [3] Connection status: 3, cellular status: 38 (submodules/mbed-system/source/connection/network_connection.cpp:173)
AT+CGDCONT?

+CGDCONT: 1,"IP","public4.m2minternet.com,"XXXXXXXXXXX",0,0,0,0

OK
[INFO][CELL]: Found PDP context 1
[INFO][CELL]: CellularContext PPP connect
AT+CGDATA="PPP",1

ERROR
[DBG ][CELL]: AT error -3012
[ERR ][CELL]: Failed to CONNECT
[ERR ][CELL]: Failed to open data channel!
[DBG ][CELL]: callback: 0, ptr: 2
[DBG ][CELL]: CellularContext: event 0, ptr 2
1970-01-01 00:00:11 [3] Connection status: 1, cellular status: 38 (submodules/mbed-system/source/connection/network_connection.cpp:173)
1970-01-01 00:00:11 [3] Connection status: 1, cellular status: 38 (submodules/mbed-system/source/connection/network_connection.cpp:173)
[INFO][CELL]: CellularContext disconnected

Issue request type

[x] Question
[ ] Enhancement
[ ] Bug
vidavidorra commented 5 years ago

I've got this part figured out myself now but I don't have a good source for why yet.

Apparently the R4 module can't use AT+CGDATA="PPP", to go to data mode (see AT commands manual p 135). It needs to use ATD*99***#1 to go to data mode. The only 'real' hint for that is the fact that the R4's AT commands manual doesn't explicitly document the +CGDATA command.

The DTR pin needs to be pulled low in order to go to data mode. I haven't been able to find a good source (yet) on why that is needed. Only source I have is this and this forum post.


WIth this information I don't know why the UBLOX_AT cellular target specifies AT_CGDATA=1

(see here) for the TARGET_UBLOX_C030_R41XM target. Based on the above I don't think that would work.

vidavidorra commented 5 years ago

I think I've got most of this figured out myself now. Only thing I'm still struggling with is how I can select the protocol to use (e.g. LTE Cat M1) for the SARA-R412M from the application. Can anyone help with that?

partychief commented 5 years ago

how I can select the protocol to use (e.g. LTE Cat M1) for the SARA-R412M from the application network capabilities can be set using AT+URAT e.g. AT+URAT=7 (LTE Cat M1 only) AT+URAT=8 (NBIoT only) AT+URAT=7,9 (LTE Cat M1 with EDGE fallback) Depends what MNO /MVNO SIM you use but in our situation the modem attaches to EDGE instead of LTE Cat M1, because registration took longer on the LTE roaming partner resulting in a timeout and fallback to 2G EDGE.

vidavidorra commented 5 years ago

I think I need to elaborate a bit. I know how to manually set the the protocol to use using the AT commands, that is indeed what @partychief posted using the AT+URAT=... commands. What I want to know is how I can use the OS drivers (e.g. CellularNetwork) to set the protocol, or rather the RAT (radio access technology). I've found the CellularNetwork:: set_access_technology function but I don't see anywhere internally how that could possibly be using the AT+URAT=... command to set the RAT.

ciarmcom commented 4 years ago

Thank you for raising this issue. Please note we have updated our policies and now only defects should be raised directly in GitHub. Going forward questions and enhancements will be considered in our forums, https://forums.mbed.com/ . If this issue is still relevant please re-raise it there. This GitHub issue will now be closed.