Need help to connect AT modem EM7455 PPP

IoT Modules MC/EM Series
1

Hello, i want to configure the modem EM7455 to connect trough AT commands, i have set the correct APN i think

Here is some data from port

Checking registration status…

AT+CREG?
+CREG: 0,1
OK
The device is registered in home network.

AT+CGREG?
+CGREG: 0,1
OK
The device is registered in home network.

Checking if device is already connected…

AT+CGACT?
+CGACT: 1,1
OK
Device is already connected
AT+CGACT?
+CGACT: 1,1
OK
Device is connected.
AT+CGPADDR= 1
+CGPADDR: 1,10.140.39.71
OK
IP Address of the connected profile is 10.140.39.71

AT+CGDCONT?
+CGDCONT: 1,“IP”,“internet”,“0.0.0.0”,0,0,0,0
OK
Following connection profiles are available,

CID-> 1
PDP Type->IP
APN->internet
PDP Address->0.0.0.0
Data Compression->0
Header Compression->0
AT+CGMI

Sierra Wireless, Incorporated

OK
Manufacturer : Sierra Wireless, Incorporated
AT+CGMM

EM7455

OK
Model Number : EM7455
AT+CGMR
SWI9X30C_02.30.03.00 r7804 CARMD-EV-FRMWR2 2018/07/25 01:10:04

OK
Revision : SWI9X30C_02.30.03.00 r7804 CARMD-EV-FRMWR2 2018/07/25 01:10:04
AT&V

&C: 2; &D: 2; &E: 0; &F: 0; &S: 0; &W: 0; E: 1; L: 0; M: 0; Q: 0; V: 1;
X: 1; Z: 0; \Q: 3; \S: 0; \V: 0; O: 0; S0: 0; S2: 43; S3: 13; S4: 10;
S5: 8; S6: 2; S7: 0; S8: 2; S9: 6; S10: 14; S11: 95; S30: 0; S103: 1;
S104: 1; ^PREFMODE: 0; ^DSCI: 0; ^MODE: 0; ^CPIN: ,; ^HSMSSS: 0,0,1,0

OK
AT+COPS?
+COPS: 0,0,“Digi.Mobil”,7
OK
Device is currently on “Digi.Mobil” network.

AT+CPIN?
+CPIN: READY

OK
SIM is ready
at!gstatus?

!GSTATUS:
Current Time: 188 Temperature: 32
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B1 LTE bw: 10 MHz
LTE Rx chan: 103 LTE Tx chan: 18103
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC RxM RSSI: -76 RSRP (dBm): -99
PCC RxD RSSI: -74 RSRP (dBm): -98
Tx Power: – TAC: 1B6E (7022)
RSRQ (dB): -8.9 Cell ID: 0313F616 (51639830)
SINR (dB): 4.8

OK
atd*99#;

NO CARRIER
NO Carrier: Call dis-connected

atd*99#
ERROR

2

I don’t see problem with my MC7455.

ati3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7430
Revision: SWI9X30C_02.24.03.00 r6978 CARMD-EV-FRMWR2 2017/03/02 13:36:45
MEID: 35907406009754
IMEI: 359074060097542
IMEI SV: 9
FSN: LU626300170410
+GCAP: +CGSM

OK

at!gstatus?
!GSTATUS:
Current Time: 12 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1385 LTE Tx chan: 19385
LTE CA state: INACTIVE LTE Scell band:B7
LTE Scell bw:20 MHz LTE Scell chan:3150
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC RxM RSSI: -77 RSRP (dBm): -99
PCC RxD RSSI: -94 RSRP (dBm): -140
SCC RxM RSSI: -97 RSRP (dBm): -128
SCC RxD RSSI: -108 RSRP (dBm): -140
Tx Power: 0 TAC: 0462 (1122)
RSRQ (dB): -6.8 Cell ID: 06745D16 (108289302)
SINR (dB): 13.0

OK
at+cgdcont?
+CGDCONT: 1,“IP”,“hkcsl”,“0.0.0.0”,0,0,0,0

OK

at+cgpaddr=1
+CGPADDR: 1,10.118.123.143

OK
atd99**1#
CONNECT 150000000

3

i have tried atd99**1# and i get no carrier,
can you give me the script to connect to compare?

this is some config, i am on the latest firmware

at!image?

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
FW 1 GOOD 1 0 0 ?? 02.30.03.00?
FW 2 EMPTY 0 0 0
FW 3 EMPTY 0 0 0
FW 4 EMPTY 0 0 0
Max FW images: 4
Active FW image is at slot 1

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
PRI FF GOOD 0 0 0 002.046_001 02.30.03.00_GENERIC
Max PRI images: 50

OK
at!impref?

!IMPREF:
preferred fw version: 02.30.03.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.046_001
current fw version: 02.30.03.00
current carrier name: GENERIC
current config name: GENERIC_002.046_001

OK
at!priid?

PRI Part Number: 9904609
Revision: 002.046
Customer: Generic

Carrier PRI: 9999999_9904609_SWI9X30C_02.30.03.00_00_GENERIC_002.046_001

OK

4

I don’t have script, I just type it manually in AT command port.

5

can you give me the output of at!image? at!impref?
thanks

6

ati3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7430
Revision: SWI9X30C_02.24.03.00 r6978 CARMD-EV-FRMWR2 2017/03/02 13:36:45
MEID: 35907406009754
IMEI: 359074060097542
IMEI SV: 9
FSN: LU626300170410
+GCAP: +CGSM

OK
at!image?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
FW 1 GOOD 130 0 0 ?? 02.14.03.00?
FW 2 GOOD 127 0 0 ?? 02.27.01.00?
FW 3 GOOD 131 0 0 ?? 02.24.03.00?
FW 4 GOOD 129 0 0 ?? 02.24.05.06?
Max FW images: 4
Active FW image is at slot 3

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
PRI FF GOOD 0 0 0 000.010_000 02.14.03.00_DOCOMO
PRI FF GOOD 0 0 0 002.021_000 02.24.03.00_GENERIC
PRI FF GOOD 0 0 0 002.026_000 02.24.05.06_TELSTRA
Max PRI images: 50

OK
at!impref?
!IMPREF:
preferred fw version: 02.24.03.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.021_000
current fw version: 02.24.03.00
current carrier name: GENERIC
current config name: GENERIC_002.021_000

OK

7

i still do not get it why it does not work, sould i try to rebrand the card? when i call the sim from my phone i get busy, and when i try to call from the modem i get no carrier,

8

i have got myself another modem em7455 for lenovo laptops and the same story, if i dial any number i get no carrier and if i try data connection i get no carrier

9

How about at! scact=1,1

10

at!scact?

!SCACT: 1,0

OK

at!scact=1,1

+CME ERROR: no network service

11

that means that is network problem…

12

if i make a dial-up connection in windows to use the WWAN as a modem put in the *99# dialing number it connects to the internet, it works in ubuntu also, but i want to make it work from at command, i need to make it work in mac os, the at commands are the same the errors are the same in windows and mac

13

then you can spy what the Windows or Ubuntu sends to the modem.

14

i do not know how, i did not find any info on this, do you know a way?

15

Authentication issue? How about setting username and password?

16

you need to find some spy tools on USB port on Windows or Ubuntu.
For windows, you can use attached AccessPort.zip.
AccessPort.zip (468.1 KB)

For linux, you can use attached interceptty-0.6.tar.gz
interceptty-0.6.tar.gz (93.7 KB)

17

this is the modem log from windows and it connects

03-28-2019 09:57:03.291 - Modem type: Sierra Wireless Snapdragon™ X7 LTE-A WWAN Modem
03-28-2019 09:57:03.291 - Modem inf path: oem33.inf
03-28-2019 09:57:03.291 - Modem inf section: Modem1
03-28-2019 09:57:03.291 - Matching hardware ID: usb\vid_1199&pid_9071&mi_03
03-28-2019 09:57:03.296 - Opening Modem
03-28-2019 09:57:03.297 - 115200,8,N,1, ctsfl=0, rtsctl=1
03-28-2019 09:57:03.299 - Initializing modem.
03-28-2019 09:57:03.299 - DSR is low while initializing the modem. Verify modem is turned on.
03-28-2019 09:57:03.299 - CTS is low while initializing modem.
03-28-2019 09:57:03.316 - TSP(0000): Making Call
03-28-2019 09:57:03.320 - Send: AT
03-28-2019 09:57:03.328 - Recv: AT
03-28-2019 09:57:03.328 - Command Echo
03-28-2019 09:57:03.330 - Recv: OK
03-28-2019 09:57:03.330 - Interpreted response: OK
03-28-2019 09:57:03.343 - Send: ATE0V1
03-28-2019 09:57:03.347 - Recv: ATE0V1
03-28-2019 09:57:03.347 - Command Echo
03-28-2019 09:57:03.348 - Recv: OK
03-28-2019 09:57:03.348 - Interpreted response: OK
03-28-2019 09:57:03.360 - Send: AT
03-28-2019 09:57:03.365 - Recv: OK
03-28-2019 09:57:03.365 - Interpreted response: OK
03-28-2019 09:57:03.365 - Waiting for a call.
03-28-2019 09:57:03.378 - Send: ATS0=0
03-28-2019 09:57:03.380 - Recv: OK
03-28-2019 09:57:03.380 - Interpreted response: OK
03-28-2019 09:57:03.380 - 115200,8,N,1, ctsfl=0, rtsctl=1
03-28-2019 09:57:03.390 - Initializing modem.
03-28-2019 09:57:03.390 - DSR is low while initializing the modem. Verify modem is turned on.
03-28-2019 09:57:03.390 - CTS is low while initializing modem.
03-28-2019 09:57:03.410 - Send: AT
03-28-2019 09:57:03.414 - Recv: OK
03-28-2019 09:57:03.414 - Interpreted response: OK
03-28-2019 09:57:03.425 - Send: ATE0V1
03-28-2019 09:57:03.429 - Recv: OK
03-28-2019 09:57:03.429 - Interpreted response: OK
03-28-2019 09:57:03.443 - Send: AT
03-28-2019 09:57:03.447 - Recv: OK
03-28-2019 09:57:03.447 - Interpreted response: OK
03-28-2019 09:57:03.447 - Dialing.
03-28-2019 09:57:03.447 - TSP Completing Async Operation(0x00010199) Status 0x00000000
03-28-2019 09:57:03.447 - TSP(0000): LINEEVENT: LINECALLSTATE_DIALING
03-28-2019 09:57:03.447 - TSP(0000): LINEEVENT: LINECALLSTATE_PROCEEDING
03-28-2019 09:57:03.460 - Send: ATDT*###
03-28-2019 09:57:03.465 - Recv: CONNECT 150000000
03-28-2019 09:57:03.465 - Interpreted response: Connect
03-28-2019 09:57:03.465 - Connection established at 150000000bps.
03-28-2019 09:57:03.474 - Error-control off or unknown.
03-28-2019 09:57:03.474 - Data compression off or unknown.
03-28-2019 09:57:03.476 - TSP(0000): LINEEVENT: LINECALLSTATE_CONNECTED
03-28-2019 09:57:33.482 - Read: Total: 396694, Per/Sec: 13221, Written: Total: 64501, Per/Sec: 2149
03-28-2019 09:57:49.406 - TSP(0000): Making Call

18

then you can type the same in MAC

19

ATDT*###
ERROR

this is what i get also in windows i get the same error from putty

20

from at command tester when i try

atdt*###

i get

NO CARRIER
NO Carrier: Call dis-connected