mihai
January 13, 2024, 11:31pm
1
Using linux. For some unknown reasons, AT responses seem to be truncated with the latest firmware, but they weren’t with the old one. I’ll post them here alongside other relevant debugging details:
sudo qmicli -p -d /dev/cdc-wdm0 --dms-swi-get-current-firmware
[/dev/cdc-wdm0] Successfully retrieved current firmware:
Model: EM7455
Boot version: SWI9X30C_02.38.00.00
AMSS version: SWI9X30C_02.38.00.00
SKU ID: 1103582
Package ID: unknown
Carrier ID: 1
Config version: 002.082_000
sudo qmicli -p -d /dev/cdc-wdm0 --dms-list-stored-images
[/dev/cdc-wdm0] Device list of stored images retrieved:
[0] Type: 'modem'
Maximum: '4'
[modem0]
Unique ID: '?_?'
Build ID: '02.24.05.06_?'
Storage index: '1'
Failure count: '0'
[modem1]
Unique ID: '?_?'
Build ID: '02.24.03.00_?'
Storage index: '2'
Failure count: '0'
[modem2]
Unique ID: '?_?'
Build ID: '02.33.03.00_?'
Storage index: '3'
Failure count: '0'
[1] Type: 'pri'
Maximum: '50'
[pri0]
Unique ID: '002.027_000'
Build ID: '02.24.05.06_ATT'
>>>>>>>>>> [CURRENT] <<<<<<<<<<
[pri1]
Unique ID: '002.082_000'
Build ID: '02.38.00.00_GENERIC'
[pri2]
Unique ID: '002.022_000'
Build ID: '02.24.03.00_SPRINT'
[pri3]
Unique ID: '002.034_000'
Build ID: '02.24.05.06_VERIZON'
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13
AT!IMPREF?
!IMPREF:
preferred fw version: 02.38.00.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.08
AT!SELRAT?
!SELRAT: 00, Automatic
OK
AT!BAND?
Index, Name
00, All bands
OK
AT+cpin?
+CPIN: READY
OK
AT!uims?
!UIMS: 0
OK
AT+CGDCONT?
+CGDCONT: 1,"IP","internet","0.0.0.0",0,0,0,0
+CGDCONT: 11,"IPV4V6","internet","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+C
I’ve manually set the apn to “internet” since that’s what this carrier requires after following this thread EM7455 Not connecting/registering to Network
But the modem still doesn’t register. Any ideas how to register with the network and what might cause minicom to not receive the full response?
jyijyi
January 14, 2024, 12:32am
2
What is the response of at!gstatus?
mihai
January 14, 2024, 12:52am
3
Hmm, it is:
!GSTATUS:
Current Time: 4492 Temperature: 28
Reset Counter: 1 Mode: ONLINE
System mode: WCDMA
(truncated, unfortunately)
Later edit:
!GSTATUS:
Current Time: 4575 Temperature: 28
Reset Counter: 1 Mode: ONLINE
System mode: LTE
looks like the “System mode” changes between LTE and WCDMA.
I managed to get a non-truncated response, but I don’t know how I did that:
!GSTATUS:
Current Time: 4618 Temperature: 28
Reset Counter: 1 Mode: ONLINE
System mode: WCDMA PS state: Not attached
WCDMA band: WCDMA 2100
WCDMA channel: 10837
GMM (PS) state:DEREGISTERED LIMITED SERVICE
MM (CS) state: IDLE LIMITED SERVICE
WCDMA L1 state:L1M_PCH_SLEEP LAC: 5ABE (23230)
RRC state: DISCONNECTED UTRAN Cell ID: 0913855D (152274269)
RxM RSSI C0: -85 RxD RSSI C0: ---
RxM RSSI C1: --- RxD RSSI C1: ---
OK
and later:
!GSTATUS:
Current Time: 4703 Temperature: 28
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: 1.4 MHz
LTE Rx chan: 0 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered No Cell
RRC state: RRC Releasing
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: FFFF (65535)
RSRQ (dB): 0.0 Cell ID: FFFFFFFF (4294967295)
SINR (dB):
OK
jyijyi
January 14, 2024, 1:13am
4
Seems there is no lte cell
mihai
January 14, 2024, 1:22am
5
I took the SIM card out of a working DWR-932, so I’d normally expect it to work.
Anyway, I tested with a different SIM from a different GSM provider and it registered, but it doesn’t seem to work properly:
Jan 14 01:21:33 rpi4b-01 ModemManager[662]: <warn> [modem0] network reject indication received
Jan 14 01:21:33 rpi4b-01 ModemManager[662]: <warn> [modem0] service domain: cs-ps
Jan 14 01:21:33 rpi4b-01 ModemManager[662]: <warn> [modem0] radio interface: lte
Jan 14 01:21:33 rpi4b-01 ModemManager[662]: <warn> [modem0] reject cause: esm-failure
!GSTATUS:
Current Time: 226 Temperature: 29
Reset Counter: 1 Mode: ONLINE
System mode: WCDMA PS state: Attached
WCDMA band: WCDMA 2100
WCDMA channel: 0
GMM (PS) state:DEREGISTERED NO SERVICE
MM (CS) state: IDLE NO SERVICE
WCDMA L1 state:L1M_STOPPED LAC: 03F2 (1010)
RRC state: DISCONNECTED UTRAN Cell ID: 00400702 (4196098)
RxM RSSI C0: --- RxD RSSI C0: ---
RxM RSSI C1: --- RxD RSSI C1: ---
OK
EDIT:
Nevermind, the new GSM provider (my personal SIM) had a different APN. It connects and works.
The trouble is, why doesn’t it work with the previous GSM provider? I tried 2 different SIM cards from the first provider, neither works, but they both work with a FIBOCOM modem. I have the SIM I copy pasted the first commands with in the FIBOCOM L-850-GL modem right now and it’s connected and working.
Are there any AT commands I might run over there to figure out why that one and the DWR-932 work as expected but the EM7455 doesn’t?
Alternatively, should I close this thread and open a new one with the issue “EM7455 doesn’t work with a particular GSM provider”?
jyijyi
January 14, 2024, 5:10am
6
Did you check the previous sim has available band for em7455?
mihai
January 14, 2024, 11:05am
7
These are the gsm frequencies Telekom Romania Mobile - Wikipedia and I’m in-between 3 towers of theirs according to cellmapper. There seem to be plenty of overlapping bands!
I checked the FIBOCOM modem and it’s connected to BAND_LTE_3 using the SIM in question, which is 1800MHz, definitely supported by EM7455, too.
jyijyi
January 14, 2024, 1:42pm
8
Is your personal SIM registering lte band 3?
mihai
January 14, 2024, 2:20pm
9
No, when in EM7455, my personal SIM uses
EUTRA Absolute RF Channel Number: '2950' (E-UTRA band 7: 2600)
AT command confirms it:
!GSTATUS:
Current Time: 45735 Temperature: 47
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B7 LTE bw: 20 MHz
LTE Rx chan: 2950 LTE Tx chan: 20950
LTE CA state: ACTIVE LTE Scell band:B3
LTE Scell bw:20 MHz LTE Scell chan:1600
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv
PCC RxM RSSI: -74 RSRP (dBm): -112
PCC RxD RSSI: -71 RSRP (dBm): -112
SCC RxM RSSI: -81 RSRP (dBm): -120
SCC RxD RSSI: -76 RSRP (dBm): -114
Tx Power: 20 TAC: 2786 (10118)
RSRQ (dB): -19.4 Cell ID: 00400706 (4196102)
SINR (dB): -3.4
OK
My personal SIM’s GSM provider also supports 1800MHz Orange Romania - Wikipedia
jyijyi
January 14, 2024, 2:41pm
10
Strange that lte b3 can be registered in secondary cell
mihai
January 14, 2024, 3:08pm
11
I may need your help in doing so. I think i’ve limited it, but not according to this status:
at!band=?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
00, All bands 000200 0000000001000000 - B3 (1700)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)
OK
at!band?
00, All bands, 0002000007C00000 00000100330818DF 0000000000000000
OK
at!gstatus?
!GSTATUS:
Current Time: 48608 Temperature: 47
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B7 LTE bw: 20 MHz
LTE Rx chan: 0 LTE Tx chan: 20950
LTE CA state: NOT ASSIGNED
EMM state: Registered Update Needed
RRC state: RRC Releasing
IMS reg state: No Srv
PCC RxM RSSI: -75 RSRP (dBm): -117
PCC RxD RSSI: -71 RSRP (dBm): -117
Tx Power: -- TAC: FFFF (65535)
RSRQ (dB): -20.0 Cell ID: FFFFFFFF (4294967295)
SINR (dB): -7.8
OK
jyijyi
January 14, 2024, 3:13pm
12
the signal rsrp is quite bad, are you sure the two antennas is connected well?
mihai
January 14, 2024, 3:27pm
13
The signal is quite bad in my office, I’ve moved the antennas above the computer screen:
!GSTATUS:
Current Time: 49559 Temperature: 45
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B7 LTE bw: 20 MHz
LTE Rx chan: 2950 LTE Tx chan: 20950
LTE CA state: INACTIVE LTE Scell band:B3
LTE Scell bw:20 MHz LTE Scell chan:1600
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv
PCC RxM RSSI: -73 RSRP (dBm): -107
PCC RxD RSSI: -76 RSRP (dBm): -109
SCC RxM RSSI: -87 RSRP (dBm): -110
SCC RxD RSSI: -86 RSRP (dBm): -108
Tx Power: 17 TAC: 2786 (10118)
RSRQ (dB): -16.0 Cell ID: 00400706 (4196102)
SINR (dB): -1.0
OK
but the final placement of the modem will be on the rooftop of the same building. The antennas are in, checked them, too.
jyijyi
January 14, 2024, 3:49pm
14
this time the signal is better, does it work with previous SIM?
here is an example of setting lte B3 only for testing your personal sim:
at!band=13,"CUSTOMER",0000000000000000,0000000000000004,0000000000000000
OK
at!band=13
OK
at!band?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000000004 0000000000000000
OK
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00
MEID: 35907206012345
ESN: 12800003752, 80000EA8
IMEI: 359072060012345
IMEI SV: 22
FSN: LQ530100512345
+GCAP: +CGSM
OK
mihai
January 14, 2024, 4:30pm
15
Here we go, Telekom SIM which doesn’t seem to work:
!GSTATUS:
Current Time: 639 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1798 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered Waiting for PDN
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -69 RSRP (dBm): -102
PCC RxD RSSI: -71 RSRP (dBm): -106
Tx Power: -- TAC: B7AF (47023)
RSRQ (dB): -12.5 Cell ID: 00013201 (78337)
SINR (dB): 11.0
OK
jyijyi
January 14, 2024, 4:44pm
16
Not sure if this is hardware issue on the TX of LTE B3…
does it work with older FW?https://source.sierrawireless.com/resources/airprime/minicard/74xx/em_mc74xx-approved-fw-packages/#sthash.4OgFEsCA.dpbs
mihai
January 15, 2024, 8:40am
17
I have a second EM7455 with older firmware, tests ran with Telekom SIM which doesn’t seem to work with EM7455:
ati
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
MEID: 35907306173225
IMEI: 359073061732255
IMEI SV: 20
FSN: LF842307730110
+GCAP: +CGSM
OK
at!band=?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
00, All bands 000200 0000000001000000 - B3 (1700)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)
OK
at!band?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000000004 0000000000000000
OK
at!gstatus?
!GSTATUS:
Current Time: 449 Temperature: 25
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1798 LTE Tx chan: 19798
LTE CA state: NOT ASSIGNED
EMM state: Deregistered PLMN Search
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -75 RSRP (dBm): -108
PCC RxD RSSI: -69 RSRP (dBm): -103
Tx Power: -- TAC: B7AF (47023)
RSRQ (dB): -13.0 Cell ID: 00013201 (78337)
SINR (dB): 8.2
OK
Could there be insufficient power coming via USB to transmit on B3, as opposed to B7?
FYI I also have 3 older MC7700 which don’t work with this carrier, this information might be relevant in the context. Could the carrier somehow be blocking some modems, but not other?
jyijyi
January 15, 2024, 9:03am
18
how about limiting to other band like B20 B8 B1?
mihai
January 15, 2024, 9:36am
19
Tests ran with Telekom, the one that doesn’t work with EM7455 but works with the other modem:
B1
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000000001 0000000000000000
OK
!GSTATUS:
Current Time: 541 Temperature: 26
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: 1.4 MHz
LTE Rx chan: 0 LTE Tx chan: 4294967295
LTE CA state: INACTIVE LTE Scell band:No band
LTE Scell bw:Unknown LTE Scell chan:77
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
SCC RxM RSSI: 0 RSRP (dBm): 0
SCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: 9908 (39176)
RSRQ (dB): 97.3 Cell ID: D042AA08 (3494029832)
SINR (dB):
OK
B8
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000000080 0000000000000000
OK
!GSTATUS:
Current Time: 848 Temperature: 26
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: 1.4 MHz
LTE Rx chan: 0 LTE Tx chan: 4294967295
LTE CA state: INACTIVE LTE Scell band:No band
LTE Scell bw:Unknown LTE Scell chan:0
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
SCC RxM RSSI: 0 RSRP (dBm): 0
SCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: 0000 (0)
RSRQ (dB): 0.0 Cell ID: 021D5E78 (35479160)
SINR (dB):
OK
B20
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000080000 0000000000000000
OK
!GSTATUS:
Current Time: 1059 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B20 LTE bw: 10 MHz
LTE Rx chan: 6350 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered Attach Needed
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -75 RSRP (dBm): -110
PCC RxD RSSI: -82 RSRP (dBm): -116
Tx Power: -- TAC: 2779 (10105)
RSRQ (dB): -16.9 Cell ID: 0028D509 (2675977)
SINR (dB): -5.0
OK
jyijyi
January 15, 2024, 9:40am
20
are you testing with your personal SIM (orange) which works with LTE B7?