*Hello,* *We are trying to get the Quectel BG96 modem to work with qmi_wwan using ModemManager and NetworkManager. * *Basically, we can only receive data but we cannot transmit data. We have tried TCP, UDP and ICMP packets. All information on our efforts is described below:*
*We followed the instructions from Quectel to support the Qeuctel BG96: * *https://www.quectel.com/UploadImage/Downlad/Quectel_WCDMA<E_Linux_USB_Driver_User_Guide_V1.8.pdf* <https://www.quectel.com/UploadImage/Downlad/Quectel_WCDMA<E_Linux_USB_Driver_User_Guide_V1.8.pdf> *Linux kernel version: 4.9.88* *ModemManager version: 1.10.8* *NetworkManager version: 1.18* *libqmi version: 1.24.0* *The udev rule for ModemManager for the BG96:* *ACTION!="add|change|move|bind", GOTO="mm_quectel_port_types_end"* *SUBSYSTEMS=="usb", ATTRS{idVendor}=="2c7c", GOTO="mm_quectel_port_types"* *GOTO="mm_quectel_port_types_end"* *LABEL="mm_quectel_port_types"* *SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="?*", ENV{.MM_USBIFNUM}="$attr{bInterfaceNumber}"* *# Quectel BG96* *ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0296", ENV{ID_MM_TTY_BAUDRATE}="115200"* *ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0296", ENV{.MM_USBIFNUM}=="00", ENV{ID_MM_PORT_TYPE_QCDM}="1"* *ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0296", ENV{.MM_USBIFNUM}=="01", ENV{ID_MM_PORT_TYPE_GPS}="1"* *ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0296", ENV{.MM_USBIFNUM}=="02", ENV{ID_MM_PORT_TYPE_AT_PRIMARY}="1"* *ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0296", ENV{.MM_USBIFNUM}=="03", ENV{ID_MM_PORT_TYPE_AT_SECONDARY}="1"* The output of ModemManager: # mmcli -m 0 -------------------------------- General | dbus path: /org/freedesktop/ModemManager1/Modem/0 | device id: cd57e3b09272b583c826a931e0e771c502c59a3d -------------------------------- Hardware | manufacturer: QUALCOMM INCORPORATED | model: 0 | revision: BG96MAR02A07M1G | h/w revision: 10000 | supported: gsm-umts, lte | current: gsm-umts, lte | equipment id: 862061043536548 -------------------------------- System | device: /sys/devices/soc0/soc/2100000.aips-bus/2184000.usb/ci_hdrc.0/usb1/1-1 | drivers: option1, qmi_wwan | plugin: Quectel | primary port: cdc-wdm0 | ports: ttyUSB0 (qcdm), ttyUSB1 (gps), ttyUSB2 (at), | cdc-wdm0 (qmi), wwan0 (net), ttyUSB3 (at) -------------------------------- Status | lock: sim-pin2 | unlock retries: sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10) | state: connected | power state: on | access tech: gsm | signal quality: 71% (recent) -------------------------------- Modes | supported: allowed: 2g; preferred: none | allowed: 4g; preferred: none | allowed: 2g, 4g; preferred: 4g | allowed: 2g, 4g; preferred: 2g | current: allowed: 2g, 4g; preferred: 4g -------------------------------- Bands | supported: egsm, dcs, pcs, g850, eutran-1, eutran-2, eutran-3, | eutran-4, eutran-5, eutran-8, eutran-12, eutran-13, eutran-17, | eutran-18, eutran-19, eutran-20, eutran-39 | current: egsm, dcs, pcs, g850, eutran-1, eutran-2, eutran-3, | eutran-4, eutran-5, eutran-8, eutran-12, eutran-13, eutran-17, | eutran-18, eutran-19, eutran-20, eutran-39 -------------------------------- IP | supported: ipv4, ipv6, ipv4v6 -------------------------------- 3GPP | imei: 862061043536548 | operator id: 20404 | registration: roaming -------------------------------- 3GPP EPS | ue mode of operation: csps-2 -------------------------------- SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0 -------------------------------- Bearer | dbus path: /org/freedesktop/ModemManager1/Bearer/0 *We have added a connection to the APN via:* # nmcli c add \ > type gsm \ > ifname "cdc-wdm0" \ > apn "vf-viriciti" \ > gsm.number "*99***1#" \ > gsm.pin "0000" Connection 'gsm-cdc-wdm0' (87994115-cbd9-48c5-b2a3-71000180722e) successfully added. *The specifications of the connection:* # nmcli c show id gsm-cdc-wdm0 connection.id: gsm-cdc-wdm0 connection.uuid: 87994115-cbd9-48c5-b2a3-71000180722e connection.stable-id: -- connection.type: gsm connection.interface-name: cdc-wdm0 connection.autoconnect: yes connection.autoconnect-priority: 0 connection.autoconnect-retries: -1 (default) connection.multi-connect: 0 (default) connection.auth-retries: -1 connection.timestamp: 1571947581 connection.read-only: no connection.permissions: -- connection.zone: -- connection.master: -- connection.slave-type: -- connection.autoconnect-slaves: -1 (default) connection.secondaries: -- connection.gateway-ping-timeout: 0 connection.metered: unknown connection.lldp: default connection.mdns: -1 (default) connection.llmnr: -1 (default) ipv4.method: auto ipv4.dns: -- ipv4.dns-search: -- ipv4.dns-options: "" ipv4.dns-priority: 0 ipv4.addresses: -- ipv4.gateway: -- ipv4.routes: -- ipv4.route-metric: -1 ipv4.route-table: 0 (unspec) ipv4.routing-rules: -- ipv4.ignore-auto-routes: no ipv4.ignore-auto-dns: no ipv4.dhcp-client-id: -- ipv4.dhcp-timeout: 0 (default) ipv4.dhcp-send-hostname: yes ipv4.dhcp-hostname: -- ipv4.dhcp-fqdn: -- ipv4.never-default: no ipv4.may-fail: yes ipv4.dad-timeout: -1 (default) ipv6.method: auto ipv6.dns: -- ipv6.dns-search: -- ipv6.dns-options: "" ipv6.dns-priority: 0 ipv6.addresses: -- ipv6.gateway: -- ipv6.routes: -- ipv6.route-metric: -1 ipv6.route-table: 0 (unspec) ipv6.routing-rules: -- ipv6.ignore-auto-routes: no ipv6.ignore-auto-dns: no ipv6.never-default: no ipv6.may-fail: yes ipv6.ip6-privacy: -1 (unknown) ipv6.addr-gen-mode: stable-privacy ipv6.dhcp-duid: -- ipv6.dhcp-send-hostname: yes ipv6.dhcp-hostname: -- ipv6.token: -- gsm.number: *99***1# gsm.username: -- gsm.password: <hidden> gsm.password-flags: 0 (none) gsm.apn: vf-viriciti gsm.network-id: -- gsm.pin: <hidden> gsm.pin-flags: 0 (none) gsm.home-only: no gsm.device-id: -- gsm.sim-id: -- gsm.sim-operator-id: -- gsm.mtu: auto proxy.method: none proxy.browser-only: no proxy.pac-url: -- proxy.pac-script: -- GENERAL.NAME <http://general.name/>: gsm-cdc-wdm0 GENERAL.UUID: 87994115-cbd9-48c5-b2a3-71000180722e GENERAL.DEVICES: cdc-wdm0 GENERAL.STATE: activated GENERAL.DEFAULT: no GENERAL.DEFAULT6: no GENERAL.SPEC-OBJECT: -- GENERAL.VPN: no GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/ActiveConnection/6 GENERAL.CON-PATH: /org/freedesktop/NetworkManager/Settings/5 GENERAL.ZONE: -- GENERAL.MASTER-PATH: -- IP4.ADDRESS[1]: 10.141.0.108/29 IP4.GATEWAY: 10.141.0.109 IP4.ROUTE[1]: dst = 10.141.0.104/29, nh = 0.0.0.0, mt = 700 IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 10.141.0.109, mt = 700 IP4.DNS[1]: 10.1.2.199 IP4.DNS[2]: 10.1.2.200 IP6.GATEWAY: -- *After the connection becomes active, the wwan0 interface comes up and we get an IP from the gateway.* # ifconfig wwan0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500 inet 10.141.0.108 netmask 255.255.255.248 destination 10.141.0.108 unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 8 bytes 397 (397.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 *But this is where it ends. We can only receive data but we cannot transmit data. We have tried TCP, UDP and ICMP packets.* *While pinging our device, the host PC outputs:* # ping 10.141.0.108 PING 10.141.0.108 (10.141.0.108): 56 data bytes Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 Request timeout for icmp_seq 3 *The device itself, outputs:* #tcpdump -vi wwan0 tcpdump: listening on wwan0, link-type RAW (Raw IP), capture size 262144 bytes 20:37:42.756650 IP (tos 0x0, ttl 251, id 19993, offset 0, flags [none], proto ICMP (1), length 84) 10.1.0.41 > 10.141.0.108: ICMP echo request, id 62574, seq 0, length 64 20:37:42.797093 IP (tos 0x0, ttl 251, id 14636, offset 0, flags [none], proto ICMP (1), length 84) 10.1.0.41 > 10.141.0.108: ICMP echo request, id 62574, seq 1, length 64 20:37:42.797103 IP (tos 0x0, ttl 251, id 64676, offset 0, flags [none], proto ICMP (1), length 84) 10.1.0.41 > 10.141.0.108: ICMP echo request, id 62574, seq 2, length 64 20:37:43.517041 IP (tos 0x0, ttl 251, id 23802, offset 0, flags [none], proto ICMP (1), length 84) 10.1.0.41 > 10.141.0.108: ICMP echo request, id 62574, seq 3, length 64 *Best regards,* *Simon*
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