MultiTech Developer Resources » Topic: PPP – Can't connect to cellular network (MTCAP-LEU1)

PPP – Can't connect to cellular network (MTCAP-LEU1)

This topic has 1 reply, 2 voices, and was last updated 4 years ago by Steve Kovarik.

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November 20, 2020 at 5:27 pm #31368

Rafael

Participant

Hi,

We have a few MTCAP-LEU1 gateways using SIM cards to connect to the internet and everything is working fine. However, more recently we bought the MTCAP-L4E1-868-001A and we’re not able to connect it to the cellular network.

Here are the logs from /var/log/messages/:

2020-11-20T21:07:31.208145+01:00 mtcap admin: ppp Unable to pull configurations from API
2020-11-20T21:07:35.568746+01:00 mtcap admin: ppp Unable to pull configurations from API
2020-11-20T21:07:48.859126+01:00 mtcap lora-network-server: GW:00-80-00-00-00-01-62-71|FRAME-RX|Parsing 1 packets
2020-11-20T21:07:48.862063+01:00 mtcap lora-network-server: GW:00-80-00-00-00-01-62-71|FRAME-RX|REJECTED|REASON: Message received from unknown device 1f-bd-2b-19 VALUE: 45
2020-11-20T21:07:59.796578+01:00 mtcap pppd[7990]: pppd 2.4.7 started by root, uid 0
2020-11-20T21:08:00.966693+01:00 mtcap chat[7999]: info: Attempting Basic Radio Communication
2020-11-20T21:08:00.967932+01:00 mtcap chat[7999]: send (AT^M)
2020-11-20T21:08:01.031988+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:01.033570+01:00 mtcap chat[7999]: AT^M^M
2020-11-20T21:08:01.036449+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:01.038247+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:01.039461+01:00 mtcap chat[7999]: info: Checking if SIM is inserted
2020-11-20T21:08:01.040349+01:00 mtcap chat[7999]: send (AT#SIMDET?^M)
2020-11-20T21:08:01.268813+01:00 mtcap chat[7999]: expect (#SIMDET: 2,1)
2020-11-20T21:08:01.272808+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.275824+01:00 mtcap chat[7999]: AT#SIMDET?^M^M
2020-11-20T21:08:01.278385+01:00 mtcap chat[7999]: #SIMDET: 2,1
2020-11-20T21:08:01.279829+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:01.281456+01:00 mtcap chat[7999]: info: Checking if SIM is locked
2020-11-20T21:08:01.284029+01:00 mtcap chat[7999]: send (AT+CPIN?^M)
2020-11-20T21:08:01.475645+01:00 mtcap chat[7999]: expect (READY)
2020-11-20T21:08:01.476012+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.476968+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.480297+01:00 mtcap chat[7999]: OK^M
2020-11-20T21:08:01.482378+01:00 mtcap chat[7999]: AT+CPIN?^M^M
2020-11-20T21:08:01.483312+01:00 mtcap chat[7999]: +CPIN: READY
2020-11-20T21:08:01.485938+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:01.486238+01:00 mtcap chat[7999]: info: SIM was unlocked
2020-11-20T21:08:01.486467+01:00 mtcap chat[7999]: info: Waiting for minimum signal strength
2020-11-20T21:08:01.486695+01:00 mtcap chat[7999]: send (AT+CSQ^M)
2020-11-20T21:08:01.630986+01:00 mtcap chat[7999]: expect (+CSQ: )
2020-11-20T21:08:01.631341+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.632368+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.633282+01:00 mtcap chat[7999]: OK^M
2020-11-20T21:08:01.638062+01:00 mtcap chat[7999]: AT+CSQ^M^M
2020-11-20T21:08:01.640059+01:00 mtcap chat[7999]: +CSQ: 
2020-11-20T21:08:01.642075+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:01.643307+01:00 mtcap chat[7999]: expect (99,99)
2020-11-20T21:08:01.644613+01:00 mtcap chat[7999]: 22,5^M
2020-11-20T21:08:01.646526+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:01.649734+01:00 mtcap chat[7999]: OK^M
2020-11-20T21:08:02.644814+01:00 mtcap chat[7999]: alarm
2020-11-20T21:08:02.645496+01:00 mtcap chat[7999]: send (AT^M)
2020-11-20T21:08:02.708186+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:02.709320+01:00 mtcap chat[7999]: AT^M^M
2020-11-20T21:08:02.710227+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:02.711042+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:02.711335+01:00 mtcap chat[7999]: send (AT^M)
2020-11-20T21:08:02.773873+01:00 mtcap chat[7999]: abort on (NO CARRIER)
2020-11-20T21:08:02.776050+01:00 mtcap chat[7999]: abort on (BUSY)
2020-11-20T21:08:02.777302+01:00 mtcap chat[7999]: abort on (ERROR)
2020-11-20T21:08:02.779426+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:02.780983+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:02.782881+01:00 mtcap chat[7999]: AT^M^M
2020-11-20T21:08:02.784324+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:02.785772+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:02.786490+01:00 mtcap chat[7999]: send (AT+CSQ^M)
2020-11-20T21:08:02.932063+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:02.933621+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:02.935482+01:00 mtcap chat[7999]: AT+CSQ^M^M
2020-11-20T21:08:02.938532+01:00 mtcap chat[7999]: +CSQ: 22,5^M
2020-11-20T21:08:02.940299+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:02.942018+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:02.943914+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:02.945139+01:00 mtcap chat[7999]: send (AT+COPS=2^M)
2020-11-20T21:08:03.151826+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:03.152662+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:03.185199+01:00 mtcap chat[7999]: AT+COPS=2^M^M
2020-11-20T21:08:03.186485+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:03.187633+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:03.188836+01:00 mtcap chat[7999]: send (AT+CGDCONT=1,\"IP\",\"soracom.io\"^M)
2020-11-20T21:08:03.828315+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:03.830156+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:03.916131+01:00 mtcap chat[7999]: AT+CGDCONT=1,"IP","soracom.io"^M^M
2020-11-20T21:08:03.917916+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:03.919559+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:03.921478+01:00 mtcap chat[7999]: send (AT+COPS=0^M)
2020-11-20T21:08:04.129338+01:00 mtcap chat[7999]: expect (OK)
2020-11-20T21:08:04.129700+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:04.187331+01:00 mtcap chat[7999]: AT+COPS=0^M^M
2020-11-20T21:08:04.190374+01:00 mtcap chat[7999]: OK
2020-11-20T21:08:04.192060+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:04.193824+01:00 mtcap chat[7999]: send (ATDT*99***1#^M)
2020-11-20T21:08:04.463372+01:00 mtcap chat[7999]: expect (CONNECT)
2020-11-20T21:08:04.464940+01:00 mtcap chat[7999]: ^M
2020-11-20T21:08:04.472993+01:00 mtcap chat[7999]: ATDT*99***1#^M^M
2020-11-20T21:08:04.475347+01:00 mtcap chat[7999]: CONNECT
2020-11-20T21:08:04.479104+01:00 mtcap chat[7999]:  -- got it
2020-11-20T21:08:04.482018+01:00 mtcap pppd[7990]: Script chat -v -t 90 -f /var/run/config/ppp_chat -c finished (pid 7999), status = 0x0
2020-11-20T21:08:04.482585+01:00 mtcap pppd[7990]: Serial connection established.
2020-11-20T21:08:04.488213+01:00 mtcap pppd[7990]: using channel 6
2020-11-20T21:08:04.501515+01:00 mtcap pppd[7990]: Using interface ppp0
2020-11-20T21:08:04.505082+01:00 mtcap pppd[7990]: Connect: ppp0 <--> /dev/modem_at0
2020-11-20T21:08:05.474830+01:00 mtcap pppd[7990]: rcvd [LCP ConfReq id=0x10 <asyncmap 0x0> <auth chap MD5> <magic 0x275c5a35> <pcomp> <accomp>]
2020-11-20T21:08:05.476302+01:00 mtcap pppd[7990]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x86b0fab4> <pcomp> <accomp>]
2020-11-20T21:08:05.486840+01:00 mtcap pppd[7990]: sent [LCP ConfAck id=0x10 <asyncmap 0x0> <auth chap MD5> <magic 0x275c5a35> <pcomp> <accomp>]
2020-11-20T21:08:05.509485+01:00 mtcap pppd[7990]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x86b0fab4> <pcomp> <accomp>]
2020-11-20T21:08:05.514391+01:00 mtcap pppd[7990]: rcvd [LCP DiscReq id=0x11 magic=0x275c5a35]
2020-11-20T21:08:05.516021+01:00 mtcap pppd[7990]: rcvd [CHAP Challenge id=0x1 <67bdf261479215e4247e45efe5668770>, name = "UMTS_CHAP_SRVR"]
2020-11-20T21:08:05.518045+01:00 mtcap pppd[7990]: sent [CHAP Response id=0x1 <0ac2a89084cd453793a2c6eff85ff45c>, name = "mtcap"]
2020-11-20T21:08:05.520545+01:00 mtcap pppd[7990]: rcvd [CHAP Success id=0x1 ""]
2020-11-20T21:08:05.521046+01:00 mtcap pppd[7990]: CHAP authentication succeeded
2020-11-20T21:08:05.521809+01:00 mtcap pppd[7990]: CHAP authentication succeeded
2020-11-20T21:08:05.522447+01:00 mtcap pppd[7990]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
2020-11-20T21:08:05.558922+01:00 mtcap pppd[7990]: Hangup (SIGHUP)
2020-11-20T21:08:05.559584+01:00 mtcap pppd[7990]: Modem hangup
2020-11-20T21:08:05.561995+01:00 mtcap pppd[7990]: Connection terminated.
2020-11-20T21:08:05.812167+01:00 mtcap monitorppp: Starting Monitoring
2020-11-20T21:08:06.642487+01:00 mtcap pppd[7990]: Connection terminated.
2020-11-20T21:08:08.835599+01:00 mtcap after-switch-inet: executing after-switch-inet hooks with [ -a -i -a eth0] arguments
2020-11-20T21:08:08.918944+01:00 mtcap after-switch-inet: restarting dnsmasq
2020-11-20T21:08:09.254522+01:00 mtcap ppp-rx-monitor: PPP Rx Monitor: Starting The Application
2020-11-20T21:08:16.361896+01:00 mtcap after-switch-inet: calling ddns checkip
2020-11-20T21:08:17.158857+01:00 mtcap after-switch-inet: triggering WANFAILOVER alert
2020-11-20T21:08:17.347973+01:00 mtcap after-switch-inet: restarting annex client
2020-11-20T21:08:17.669612+01:00 mtcap annexcd: [NOTICE] main.cc:wait_signals_loop:609: SIGTERM caught
2020-11-20T21:08:17.894308+01:00 mtcap after-switch-inet: done.
2020-11-20T21:08:20.583119+01:00 mtcap annexcd: [INFO] main.cc:detect_device_type_by_eeprom:437: eeprom vendor-id: Multi-Tech Systems
2020-11-20T21:08:20.584748+01:00 mtcap annexcd: [INFO] main.cc:detect_device_type_by_eeprom:438: eeprom product-id: MTCAP-L4E1-868-001A

PPP configuration (db.json):


   "ppp" : {                                                                                                                          
      "__v" : 1,                       
      "authentication" : {                                                                                                            
         "password" : "",               
         "type" : "NONE",                                                                                                             
         "username" : ""                                                                                                              
      },                                                                                                                              
      "connectTimeout" : 90,                
      "dialOnDemand" : false,                                                                                                         
      "diversity" : true,             
      "enabled" : true,                                                                                                               
      "idleTimeout" : 180,            
      "keepAlive" : {                     
         "dataRecv" : {                     
            "enabled" : true,               
            "window" : 60             
         },                          
         "enabled" : false,           
         "hostname" : "",             
         "icmpCount" : 4,             
         "pingInterval" : 60,           
         "radioReboot" : {                        
            "enabled" : false            
         },                                       
         "tcpPort" : 80,             
         "type" : "ICMP"                          
      },                                                     
      "maxRetries" : 0, 
      "modem" : {                                                                                                                     
         "apnString" : "soracom.io",                                                                                                  
         "baudRate" : 115200,                                                                                                         
         "commands" : [],                   
         "connectString" : "CONNECT",                                                                                                 
         "contextId" : 1,             
         "dialNumber" : "*99***1#",                                                                                                   
         "dialPrefix" : "ATDT",       
         "fwSwitch" : "auto",             
         "initStrings" : [ "AT+CSQ", "", "", "" ],
         "simPin" : ""                      
      },                              
      "nat" : true,                  
      "powerOnInitString" : "",                   
      "protocol" : "PPP",             
      "wakeUpOnCall" : {              
         "ackString" : "",              
         "callerIds" : [],                        
         "delay" : 10,                   
         "enabled" : false,                       
         "fromLan" : false,          
         "initStrings" : [],                      
         "onCallerId" : false,                               
         "onRing" : false,                        
         "onSms" : false                    
      }                                           
   },

sudo ifconfig:


eth0      Link encap:Ethernet  HWaddr 00:08:00:4A:B0:DB  
          inet addr:172.20.223.78  Bcast:172.20.223.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3931 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3392 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:350356 (342.1 KiB)  TX bytes:783300 (764.9 KiB)
          Interrupt:23 Base address:0xc000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:32090 errors:0 dropped:0 overruns:0 frame:0
          TX packets:32090 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:2019387 (1.9 MiB)  TX bytes:2019387 (1.9 MiB)

As you can see, there’s no ppp0 interface in the output of the ifconfig. We configured the gateway using the Web UI.

Any ideas on how to solve this problem?

Thanks,

Rafael

November 20, 2020 at 6:15 pm #31369

Steve Kovarik

Moderator

Hi Rafeal

We would recommend that you first upgrade the MTCAP-L4E1 to the latest firmware version 5.3.0 then factory default the device by holding in the reset button for 10 seconds then reconfigure.
The MTCAP 5.2.0 firmware van be found at the link http://www.multitech.net/developer/downloads/

If the problem persists open a support ticket at https://support.multitech.com/support/dashboard.html

-Best Regards

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PPP – Can't connect to cellular network (MTCAP-LEU1)

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