Hello!
I'm hoping some good soul with more experience in PPP and GSM modems
will be able to help me out here. As a disclaimer, I have almost zero
experience with GSM modems, so please excuse any obviously stupid
things (;
I have Huawei me906e modem with a working SIM card (I've just checked
it again in my phone and it does connect to the internet and I can
browse www). Some time ago I've checked the modem as a network card for
PC and it was working fine in Windows, but I couldn't get it to work in
Linux, but generally it works fine (in Windows [; ). Now I'm testing it
with lwip in Linux with a simple test application. So I issue some AT
commands, switch the modem to data mode and start lwip. I based my code
on the "example_app" that can be found in the head of the repository. I
did not enable any authorization, as the card does not require user and
password. It seems to work somehow up to a certain point where the
modem just disconnects and switches back to command mode. Here's the
log of what is going on:
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
Wrote: AT
Read: OK
Wrote: ATI
Read: Manufacturer: Huawei Technologies Co., Ltd.
Read: Model: ME906E
Read: Revision: 12.430.19.08.00
Read: IMEI: ...
Read: +GCAP: +CGSM
Read: OK
Wrote: AT+COPS=1,0,"PLAY",2
Read: OK
Wrote: AT+COPS?
Read: +COPS: 1,0,"PLAY",2
Read: OK
Wrote: AT+CREG=2
Read: OK
Wrote: AT+CREG?
Read: +CREG: 2,1,"D6","1857B3",2
Read: OK
Wrote: AT+CGREG=1
Read: OK
Wrote: AT+CGREG?
Read: +CGREG: 1,1
Read: OK
Wrote: AT+CGATT=1
Read: OK
Wrote: AT+CGATT?
Read: +CGATT: 1
Read: OK
Wrote: AT+CGACT=1,1
Read: OK
Wrote: AT+CGACT?
Read: +CGACT: 1,1
Read: +CGACT: 2,0
Read: +CGACT: 16,0
Read: OK
Wrote: AT+CGDCONT?
Read: +CGDCONT: 1,"IP","Internet","0.0.0.0",0,0
Read: +CGDCONT: 2,"IP","internet","0.0.0.0",1,1
Read: +CGDCONT: 16,"IP","www.plusgsm.pl","0.0.0.0",0,0
Read: OK
Wrote: ATD*99#
Read: CONNECT 43200000
ppp phase changed[1]: phase=0
ppp_connect[1]: holdoff=0
ppp phase changed[1]: phase=3
pppos_connect: unit 1: connecting
ppp_start[1]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=FF FF FF FF
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=0 CHAP_MD5=0 CHAP_MS=0 CHAP_MS2=0 EAP=0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x7ecae32e> <pcomp> <accomp>]
pppos_write[1]: len=24
ppp_start[1]: finished
pppos_input[1]: got 53 bytes
rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x4fe5c633>
<pcomp> <accomp>]
No auth is possible
sent [LCP ConfRej id=0x0 <auth chap MD5>]
pppos_write[1]: len=13
pppos_input[1]: got 46 bytes
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x7ecae32e> <pcomp> <accomp>]
pppos_input[1]: got 45 bytes
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x4fe5c633> <pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x4fe5c633> <pcomp> <accomp>]
pppos_write[1]: len=24
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
ccp_set[1]: is_open=1, is_up=0, receive_method=0, transmit_method=0
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0>
<ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
pppos_input[1]: got 21 bytes
rcvd [LCP DiscReq id=0x2 magic=0x4fe5c633]
pppos_input[1]: got 14 bytes
^C
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
This last "pppos_input[1]: got 14 bytes" is just the "NO CARRIER" from
the modem after it disconnects. This all happens almost instantly -
after switching to data mode all the following commands take less than
a second.
Seeing the first request from the modem (request for CHAP MD5
authorisation), I've also tried to enable "ANY" authorisation mode (or
just CHAP) and using "" both for user and password, but the behaviour
is mostly similar - the modem starts sending CHAP challenges, lwip
doesn't answer anything (I assume this is because the user and password
are empty, right?), and after some time the modem disconnects
("pppos_input[1]: got 14 bytes" == "NO CARRIER"). Here's the log:
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
Wrote: AT
Read: OK
Wrote: ATI
Read: Manufacturer: Huawei Technologies Co., Ltd.
Read: Model: ME906E
Read: Revision: 12.430.19.08.00
Read: IMEI: ...
Read: +GCAP: +CGSM
Read: OK
Wrote: AT+COPS=1,0,"PLAY",2
Read: OK
Wrote: AT+COPS?
Read: +COPS: 1,0,"PLAY",2
Read: OK
Wrote: AT+CREG=2
Read: OK
Wrote: AT+CREG?
Read: +CREG: 2,1,"D6","1857B3",2
Read: OK
Wrote: AT+CGREG=1
Read: OK
Wrote: AT+CGREG?
Read: +CGREG: 1,1
Read: OK
Wrote: AT+CGATT=1
Read: OK
Wrote: AT+CGATT?
Read: +CGATT: 1
Read: OK
Wrote: AT+CGACT=1,1
Read: OK
Wrote: AT+CGACT?
Read: +CGACT: 1,1
Read: +CGACT: 2,0
Read: +CGACT: 16,0
Read: OK
Wrote: AT+CGDCONT?
Read: +CGDCONT: 1,"IP","Internet","0.0.0.0",0,0
Read: +CGDCONT: 2,"IP","internet","0.0.0.0",1,1
Read: +CGDCONT: 16,"IP","www.plusgsm.pl","0.0.0.0",0,0
Read: OK
Wrote: ATD*99#
Read: CONNECT 43200000
ppp phase changed[1]: phase=0
ppp_connect[1]: holdoff=0
ppp phase changed[1]: phase=3
pppos_connect: unit 1: connecting
ppp_start[1]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=FF FF FF FF
ppp_recv_config[1]
ppp: auth protocols: PAP=1 CHAP=1 CHAP_MD5=1 CHAP_MS=1 CHAP_MS2=1 EAP=1
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x8d98cb61> <pcomp> <accomp>]
pppos_write[1]: len=24
ppp_start[1]: finished
pppos_input[1]: got 53 bytes
rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x4fe7b5a6>
<pcomp> <accomp>]
sent [LCP ConfAck id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x4fe7b5a6>
<pcomp> <accomp>]
pppos_write[1]: len=29
pppos_input[1]: got 45 bytes
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x8d98cb61> <pcomp> <accomp>]
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
pppos_input[1]: got 22 bytes
rcvd [LCP DiscReq id=0x1 magic=0x4fe7b5a6]
pppos_input[1]: got 42 bytes
rcvd [CHAP Challenge id=0x1 <7eea571d3e05e4766c661474fc7750e7>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 41 bytes
rcvd [CHAP Challenge id=0x2 <08b8f55348400529024cbf177c231710>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 41 bytes
rcvd [CHAP Challenge id=0x3 <24aa1a5f425298cf88d54019aae082ef>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 41 bytes
rcvd [CHAP Challenge id=0x4 <be336c79383db9ae2681620386e70c38>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 41 bytes
rcvd [CHAP Challenge id=0x5 <282b34d778bdfda15e64a21976646bf4>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 41 bytes
rcvd [CHAP Challenge id=0x6 <56fc90b6bccfa6e8f8b6901ff863dc55>, name =
"UMTS_CHAP_SRVR"]
pppos_input[1]: got 14 bytes
^C
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
Any ideas what am I doing wrong? There are just too many variables for
me to go further, as I'm not sure about anything here. Whether the AT
commands that I issue and their arguments are correct, I'm not sure
whether I should stick to "NONE" authentication or just keep using
"ANY" with empty user/password, maybe my lwipopts.h are wrong, and so
on and so on... So any help will be greatly appreciated!
Thanks in advance!
Regards,
FCh
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