Obviously you need to do the basic checks that the Oppo is turned on, has the DLNA feature enabled, and is connected to the LAN. Then you need to check your network configuration. Check that all devices are on the same subnet. Check that all have IP addresses in the same address band that your router is routing.
They are @192.168.1.x
Check that the IP addresses are issued via DHCP.
They are
Check that there are no devices using the same IP address.
This is also OK
Check that your router is able to route UDP mono cast and UDP multicast datagrams (SSDP discovery).
Do not know how to check this ...
Check that there are no firewalls or AV programs blocking LAN access in general, or for the specific IP addresses being used. If your network topology is not "flat" then make it so. If you have more than one router then remove all but one. Etc.
here it is my network topology
https://www.dropbox.com/s/r06j33ofecwooq7/Screenshot%202017-04-19%2012.48.11.png?dl=0a. the WAN enter the ADB2200 modem / router / access point (AP1) / switch . The DHCP is ON. This unut is connected in my hobby room
b. LAN1 of the ADB2200 is connected to a Netgear WNDR-4500 router / access point (AP2) with DHCP OFF. This unit is located in my apartment and is suspicous to be the problem here
c. H3 is a DVB receiver (supposedly it will not hurt)
d. a Chromecast device is in the hobby room and connects to AP1 access point (IP @192.168.1.9)
e. the oppo 105D is connect to LAN4 of ADB220 (it is named as udhcp, do not know why ...)
f. The JRiver media server is on a PC with a (static) IP address @192.168.1.149
g. The media file database is located ina QNAP NAS with a (static) IP address @192.168.1.150
d. a Chromecast device is in the main house and connects to AP2 access point (IP @192.168.1.4)
What I see
- I connect an Android smartphone to AP1: Bubble UPnP can see the Oppo 105D renderer (it takes a while but finalle it appears among the suitable renderers), JRemote can't
- Both the JRiver client/server on MEDIA-SERVER PC and JRemote cannot see the Oppo 105D amonge the displayed 'zones'
- I installed a Bubble UPnP server on MEDIA-SERVER PC: during configuration it cannot see Chromecast 192.168.1.9
It looks like the WNDR-4500 is blocking something but I am surprised the Bubble UPnP can still see MEDIA SERVER and Oppo 105 if connected to AP1. Is the any configuration I should consider for the WNDR4500? It is used as a simple AP and switch so I cannot figure out how does it hurt ...
My JRiver settings can be found here
https://www.dropbox.com/s/va1wtr5ws3hwn21/Screenshot%202017-04-21%2012.57.10.png?dl=0Thanks so much for helping me