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Posts: 18
Joined: Tue Mar 26, 2019 6:19 pm

Sierra MC7455 with RouterOS 7.1b3 on RB922UAGS

Sun Dec 20, 2020 7:27 pm

I have a Sierra MC7455 , when connecting to the RB922UAGS routerboard it does get recognized but not as an LTE interface but rather as a serial device using PPP.

The modem has the USB 3.0 pins taped out, it is running in usbcomp mode 8( verified using script used on a laptop with a USB/mini-pci adapter) :
*  8 - DM   NMEA  AT    MBIM                            SUPPORTED
Only other modes supported are MBIM only (9) and QMI (6) tried both but didn't got something else.

Device info:
> system resource print  
                   uptime: 2m14s
                  version: 7.1beta3 (development)
               build-time: Dec/02/2020 15:59:47
         factory-software: 6.28
              free-memory: 89.7MiB
             total-memory: 128.0MiB
                      cpu: MIPS 74Kc V5.0
                cpu-count: 1
            cpu-frequency: 720MHz
                 cpu-load: 0%
           free-hdd-space: 111.4MiB
          total-hdd-space: 128.0MiB
  write-sect-since-reboot: 92
         write-sect-total: 7115
               bad-blocks: 0%
        architecture-name: mipsbe
               board-name: RB922UAGS-5HPacD
                 platform: MikroTik
USB info:
> system resource usb print  
  #  DEV  VENDOR                         NAME                                                           SPE
  0  2-1  Sierra Wireless, Incorporated  Sierra Wireless MC7455 QualcommC2AE SnapdragonE284A2 X7 LTE-A  480
  1  1-0  Linux 5.6.3 ehci_hcd           RB400 EHCI                                                     480
  2  2-0  Linux 5.6.3 ehci_hcd           RB400 EHCI                                                     480
Config export (getting stuck in the middle):

 > export 
# dec/20/2020 19:21:36 by RouterOS 7.1beta3
# software id = PZZI-24MA
# model = 922UAGS-5HPacD
# serial number = 9F880996E072
/interface bridge
add admin-mac=B8:69:F4:21:50:4F auto-mac=no comment=defconf name=bridge
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-a/n/ac channel-width=20/40/80mhz-XXXX disabled=no frequency=auto installation=outdoor mode=ap-bridge ssid=MikroTik-215051
/interface lte apn
set [ find default=yes ] ip-type=ipv4
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip vrf
add list=all name=main
set 0 name=usb1
/interface ppp-client
add apn=internet name=ppp-out1 port=usb1
/routing table
add fib name=""
/interface bridge port
add bridge=bridge comment=defconf interface=ether1
add bridge=bridge comment=defconf interface=sfp1
add bridge=bridge comment=defconf interface=wlan1
/ip neighbor discovery-settings
set discover-interface-list=*2000003
/ipv6 settings
set disable-ipv6=yes
/ip dhcp-client
add comment=defconf disabled=no interface=bridge
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Re: Sierra MC7455 with RouterOS 7.1b3 on RB922UAGS

Wed Dec 30, 2020 1:35 pm

Your modem should be supported in MBIM mode. But you will not be able to talk to it using at-chat.

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Posts: 18
Joined: Tue Mar 26, 2019 6:19 pm

Re: Sierra MC7455 with RouterOS 7.1b3 on RB922UAGS

Mon Jan 04, 2021 7:04 pm

Downgrading to  7.1beta2 fixed the issue

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