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[RM520N-GL WDS session drops every 2 minutes in QMI mode — firmware RM520NGLAAR03A03M4G][2]
RM520N-GL periodic WDS session drops every ~2 minutes in QMI/raw_ip mode on Linux
Device Information
Module: Quectel RM520N-GL
Firmware: RM520NGLAAR03A03M4G
Host platform: Linux 6.6.52
Driver: qmi_wwan (raw_ip mode)
Interface: wwan0 (QMI mode, no rmnet)
RAT: LTE Band 3 (FDD 1800 MHz)
Observed Behavior
The QMI WDS data session drops every approximately 2 minutes, regardless of:
Signal quality (RSSI -59 to -65 dBm, RSRP -88 dBm, SNR 2-8 dB — stable throughout)
Network registration (always registered, never drops)
Traffic activity (drops occur with or without active data transfer)
Keepalive pings (25-second ICMP keepalives to 8.8.8.8 do not pr