Yes, "push route 192.168.10.0 255.255.225.0" it's already set in the vpn server config.
I've connected a client with a modem 3g mobile connection and here the route table and the wireshark log (I've recorded the client virtual TAP lan when pinging a network printer in the server lan):
Routle table withouth VPN:
IPv4 Tabella route
===========================================================================
Route attive:
Indirizzo rete Mask Gateway Interfaccia Metrica
0.0.0.0 0.0.0.0 On-link 176.201.91.112 31
127.0.0.0 255.0.0.0 On-link 127.0.0.1 4531
127.0.0.1 255.255.255.255 On-link 127.0.0.1 4531
127.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
176.201.91.112 255.255.255.255 On-link 176.201.91.112 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 4531
224.0.0.0 240.0.0.0 On-link 176.201.91.112 31
255.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
255.255.255.255 255.255.255.255 On-link 176.201.91.112 286
===========================================================================
Route permanenti:
Nessuna
Routle table with VPN active:
IPv4 Tabella route
===========================================================================
Route attive:
Indirizzo rete Mask Gateway Interfaccia Metrica
0.0.0.0 0.0.0.0 On-link 176.201.91.112 31
10.5.0.4 255.255.255.252 On-link 10.5.0.6 4511
10.5.0.6 255.255.255.255 On-link 10.5.0.6 4511
10.5.0.7 255.255.255.255 On-link 10.5.0.6 4511
127.0.0.0 255.0.0.0 On-link 127.0.0.1 4531
127.0.0.1 255.255.255.255 On-link 127.0.0.1 4531
127.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
176.201.91.112 255.255.255.255 On-link 176.201.91.112 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 4531
224.0.0.0 240.0.0.0 On-link 10.5.0.6 4511
224.0.0.0 240.0.0.0 On-link 176.201.91.112 31
255.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
255.255.255.255 255.255.255.255 On-link 10.5.0.6 4511
255.255.255.255 255.255.255.255 On-link 176.201.91.112 286
===========================================================================
Route permanenti:
Nessuna
Wireshark log (recorded client virtual TAP lan when pinging network printer on the server lan):
"No.","Time","Source","Destination","Protocol","Length","Info"
"1","0.000000000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=386/33281, ttl=128"
"2","0.127731000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=386/33281, ttl=62"
"3","1.007821000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=387/33537, ttl=128"
"4","1.177889000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=387/33537, ttl=62"
"5","2.017665000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=388/33793, ttl=128"
"6","2.148218000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=388/33793, ttl=62"
"7","3.025427000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=389/34049, ttl=128"
"8","3.028838000","10.5.0.6","239.255.255.250","UDP","694","Source port: 62287 Destination port: ws-discovery"
"9","3.029760000","fe80::a16b:dc17:b42a:f7e3","ff02::c","UDP","714","Source port: 62288 Destination port: ws-discovery"
"10","3.093025000","10.5.0.6","239.255.255.250","UDP","694","Source port: 62287 Destination port: ws-discovery"
"11","3.137846000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=389/34049, ttl=62"
"12","3.140783000","fe80::a16b:dc17:b42a:f7e3","ff02::c","UDP","714","Source port: 62288 Destination port: ws-discovery"
"13","4.034241000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=390/34305, ttl=128"
"14","4.158167000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=390/34305, ttl=62"
"15","5.051783000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=391/34561, ttl=128"
"16","5.177851000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=391/34561, ttl=62"
"17","6.059701000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=392/34817, ttl=128"
"18","6.187918000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=392/34817, ttl=62"
"19","7.067443000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=393/35073, ttl=128"
"20","7.177974000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=393/35073, ttl=62"
"21","8.075354000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=394/35329, ttl=128"
"22","8.197841000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=394/35329, ttl=62"
"23","9.086984000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=395/35585, ttl=128"
"24","9.207976000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=395/35585, ttl=62"
"25","10.093829000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=396/35841, ttl=128"
"26","10.207978000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=396/35841, ttl=62"
"27","11.100680000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=397/36097, ttl=128"
"28","11.218100000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=397/36097, ttl=62"
"29","11.458526000","10.5.0.6","192.168.10.9","SNMP","160","get-request 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3 1.3.6.1.2.1.43.8.2.1.18.1.4 1.3.6.1.2.1.43.8.2.1.18.1.5"
"30","11.878136000","192.168.10.9","10.5.0.6","SNMP","160","get-response 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3 1.3.6.1.2.1.43.8.2.1.18.1.4 1.3.6.1.2.1.43.8.2.1.18.1.5"
"31","11.878431000","10.5.0.6","192.168.10.9","SNMP","142","get-request 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3 1.3.6.1.2.1.43.8.2.1.18.1.4"
"32","12.007969000","192.168.10.9","10.5.0.6","SNMP","142","get-response 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3 1.3.6.1.2.1.43.8.2.1.18.1.4"
"33","12.008224000","10.5.0.6","192.168.10.9","SNMP","124","get-request 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3"
"34","12.109474000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=398/36353, ttl=128"
"35","12.138098000","192.168.10.9","10.5.0.6","SNMP","151","get-response 1.3.6.1.2.1.43.8.2.1.18.1.1 1.3.6.1.2.1.43.8.2.1.18.1.2 1.3.6.1.2.1.43.8.2.1.18.1.3"
"36","12.477961000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=398/36353, ttl=62"
"37","13.117310000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=399/36609, ttl=128"
"38","13.228221000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=399/36609, ttl=62"
"39","14.125116000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=400/36865, ttl=128"
"40","14.238085000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=400/36865, ttl=62"
"41","15.131953000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=401/37121, ttl=128"
"42","15.268093000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=401/37121, ttl=62"
"43","16.138809000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=402/37377, ttl=128"
"44","16.268080000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=402/37377, ttl=62"
"45","17.146627000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=403/37633, ttl=128"
"46","17.298685000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=403/37633, ttl=62"
"47","18.157451000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=404/37889, ttl=128"
"48","18.268327000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=404/37889, ttl=62"
"49","19.167215000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=405/38145, ttl=128"
"50","19.408527000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=405/38145, ttl=62"
"51","20.175945000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=406/38401, ttl=128"
"52","20.578489000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=406/38401, ttl=62"
"53","21.192613000","10.5.0.6","192.168.10.9","ICMP","74","Echo (ping) request id=0x0001, seq=407/38657, ttl=128"
"54","21.778221000","192.168.10.9","10.5.0.6","ICMP","74","Echo (ping) reply id=0x0001, seq=407/38657, ttl=62"
I can't read clearly wireshark log, but seems that's no errors in communication?