<div dir="ltr">Hi all, I am using the following: 1. EM9191 modem (5NR/LTE). 2. Centos 7.8, kernel 4.19.128 aarch64 architecture. 3. mbimcli 1.14.2 (Copyright (2013-2014) Aleksander Morgado) I have encountered the next disconnection issue : 1. Connect by running the mbimcli commands manually (added them in the end of the post), fetch the ip,dns and etc info and set the wwan0 interface manually in linux: ip address add X.X.X.X/30 dev wwan0 ip link set dev wwan0 up ip route add default dev wwan0 [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-connection-state [/dev/cdc-wdm0] Connection status: Session ID: '0' Activation state: 'activated' Voice call state: 'none' IP type: 'ipv4' Context type: 'internet' Network error: 'unknown' [root@localhost /]# 2. Run pings test to google and see that everything is fine. 3. After roughly 6-7K of pings, (around 1.5-2 hours) the pings reply response is missing, the communication is lost. The connection state says 'deactivated': [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-connection-state [/dev/cdc-wdm0] Connection status: Session ID: '0' Activation state: 'deactivated' Voice call state: 'none' IP type: 'default' Context type: 'none' Network error: 'unknown' [root@localhost /]# What could possibly be the reason for such behavior? Tested it on 2 EM9191 modems,different SIM providers, same result. The connection commands i use: [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-radio-state --no-close [/dev/cdc-wdm0] Radio state retrieved: Hardware Radio State: 'on' Software Radio State: 'on' [/dev/cdc-wdm0] Session not closed: TRID: '4' [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-subscriber-ready-status --no-open=4 --no-close [/dev/cdc-wdm0] Subscriber ready status retrieved: Ready state: 'initialized' Subscriber ID: 'XXXXXXXXXXXX' SIM ICCID: 'XXXXXXXXXXXX' Ready info: 'none' Telephone numbers: (0) 'unknown' [/dev/cdc-wdm0] Session not closed: TRID: '6' [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-registration-state --no-open=6 --no-close [/dev/cdc-wdm0] Registration status: Network error: 'unknown' Register state: 'home' Register mode: 'automatic' Available data classes: 'lte, custom' Current cellular class: 'gsm' Provider ID: '42501' Provider name: 'Partner' Roaming text: 'unknown' Registration flags: 'packet-service-automatic-attach' [/dev/cdc-wdm0] Session not closed: TRID: '8' [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --query-packet-service-state --no-open=8 --no-close [/dev/cdc-wdm0] Packet service status: Network error: 'unknown' Packet service state: 'attached' Available data classes: 'custom' Uplink speed: '1200000000 bps' Downlink speed: '3200000000 bps' [/dev/cdc-wdm0] Session not closed: TRID: '10' [root@localhost /]# mbimcli -p -d /dev/cdc-wdm0 --connect=apn='<a href="http://publicip.net.il">publicip.net.il</a>' , ip-type='ipv4' --no-open=10 --no-close [/dev/cdc-wdm0] Successfully connected [/dev/cdc-wdm0] Connection status: Session ID: '0' Activation state: 'activated' Voice call state: 'none' IP type: 'ipv4' Context type: 'internet' Network error: 'unknown' [/dev/cdc-wdm0] IPv4 configuration available: 'address, gateway, dns, mtu' IP [0]: 'X.X.X.X/30' Gateway: 'X.X.X.169' DNS [0]: '82.102.139.10' DNS [1]: '82.102.139.20' MTU: '1500' [/dev/cdc-wdm0] IPv6 configuration available: 'none' [/dev/cdc-wdm0] Session not closed: TRID: '13' [root@localhost /]# Thanks in advance, Roman.</div>