@crispyoz Thanks for clarifying and thanks for all your effort helping me find a solution especially as volunteer.

You Rock!

So are you saying the warp-core driver is end-of-life or no longer supported by the developer?
And no plans to update it with the current OpenWRT release?

@crispyoz Thanks for following up.
I don't think I want to go down that road. I actually had started to do this originally before posting here following the instruction in this thread:
https://forum.openwrt.org/t/cannot-ping-devices-in-the-same-local-network/131988/58
It presented many new problems.

I'll keep with the work-around for now. I'm assuming there can be a trouble-ticket filed for getting the driver issue resolved in the mean time?

I appreciate all your help with this.
I understand the implications of this workaround and I realized this workaround also after the one command worked.
I can get by with this for now, but it would be nice to have a cleaner resolution to this

Thu Feb 29 14:01:54 2024 user.notice route: Starting interface hotplug device: l
o Action: ifup Interface: loopback
Thu Feb 29 14:02:07 2024 user.notice route: Starting interface hotplug device: b
r-wlan Action: ifup Interface: wlan
Thu Feb 29 14:02:09 2024 user.notice route: Starting interface hotplug device: a
pcli0 Action: ifup Interface: wwan
Thu Feb 29 14:02:09 2024 user.notice route: IFUP apcli0
Thu Feb 29 14:05:00 2024 user.notice route: Starting interface hotplug device:
Action: ifdown Interface: loopback
Thu Feb 29 14:05:01 2024 user.notice route: Starting interface hotplug device:
Action: ifdown Interface: wlan
Thu Feb 29 14:05:01 2024 user.notice route: Starting interface hotplug device:
Action: ifdown Interface: wwan
Thu Feb 29 14:05:08 2024 user.notice route: Starting interface hotplug device: l
o Action: ifup Interface: loopback
Thu Feb 29 14:05:09 2024 user.notice route: Starting interface hotplug device: a
pcli0 Action: ifup Interface: wwan
Thu Feb 29 14:05:09 2024 user.notice route: IFUP apcli0
Thu Feb 29 14:05:10 2024 user.notice route: Starting interface hotplug device: b
r-wlan Action: ifup Interface: wlan

That didn't work.
And I don't know where to retrieve the log from.
It didn't show up in the command line output

Not working with those options removed.

root@Omega-3DA9:/# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.240.0   U     0      0        0 apcli0
192.168.3.0     *               255.255.255.0   U     0      0        0 br-wlan
root@Omega-3DA9:/# cd etc/config
root@Omega-3DA9:/etc/config# cat network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd1d:48c4:7633::/48'

config interface 'wlan'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.3.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wwan'
        option ifname 'apcli0'
        option hostname 'Omega-3DA9'
        option proto 'static'
        option ipaddr '192.168.5.88'
        option netmask '255.255.240.0'
        option gateway '192.168.5.254'
        option dns '8.8.8.8'

config interface 'wan'
        option ifname 'eth0'
        option proto 'dhcp'

config route 'default'
        option interface 'wwan'
        option gateway '192.168.5.254'
        option metric '0'

root@Omega-3DA9:/etc/config# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
ping: sendto: Network unreachable
root@Omega-3DA9:/etc/config# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.240.0   U     0      0        0 apcli0
192.168.3.0     *               255.255.255.0   U     0      0        0 br-wlan

root@Omega-3DA9:/etc/config# cat network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd1d:48c4:7633::/48'

config interface 'wlan'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.3.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wwan'
        option ifname 'apcli0'
        option hostname 'Omega-3DA9'
        option proto 'static'
        option ipaddr '192.168.5.88'
        option netmask '255.255.240.0'
        option gateway '192.168.5.254'
        option dns '8.8.8.8'

config interface 'wan'
        option ifname 'eth0'
        option proto 'dhcp'

config route 'default'
        option interface 'wwan'
        option gateway '192.168.5.254'
        option target '0.0.0.0'
        option netmask '0.0.0.0'
        option metric '0'

That worked!

root@Omega-3DA9:/etc/config# ip route add default via 192.168.5.254 dev apcli0
root@Omega-3DA9:/etc/config# ip route get 8.8.8.8
8.8.8.8 via 192.168.5.254 dev apcli0  src 192.168.5.88
root@Omega-3DA9:/etc/config# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=117 time=21.440 ms
64 bytes from 8.8.8.8: seq=1 ttl=117 time=21.110 ms
64 bytes from 8.8.8.8: seq=2 ttl=117 time=24.762 ms
64 bytes from 8.8.8.8: seq=3 ttl=117 time=30.374 ms
64 bytes from 8.8.8.8: seq=4 ttl=117 time=39.886 ms
^C
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 21.110/27.514/39.886 ms
root@Omega-3DA9:/etc/config# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.5.254   0.0.0.0         UG    0      0        0 apcli0
192.168.0.0     *               255.255.240.0   U     0      0        0 apcli0
192.168.3.0     *               255.255.255.0   U     0      0        0 br-wlan

Still no luck.

root@Omega-3DA9:/etc/config# cat network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd1d:48c4:7633::/48'

config interface 'wlan'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.3.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wwan'
        option ifname 'apcli0'
        option hostname 'Omega-3DA9'
        option proto 'static'
        option ipaddr '192.168.5.88'
        option gateway '192.168.5.254'
        option netmask '255.255.240.0'
        option dns '8.8.8.8'

config interface 'wan'
        option ifname 'eth0'
        option proto 'dhcp'

config route 'default'
        option interface 'wwan'
        option gateway '192.168.5.254'
        option target '0.0.0.0'
        option netmask '0.0.0.0'
        option metric '0'

root@Omega-3DA9:/etc/config# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.240.0   U     0      0        0 apcli0
192.168.3.0     *               255.255.255.0   U     0      0        0 br-wlan
root@Omega-3DA9:/etc/config# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
ping: sendto: Network unreachable