Pfsense openvpn & dd-wrt openvpn site-to-site

[aiguo]

Hello everyone, I need to set up a site-to-site network （OpenVPN)

site A：pfsense2.3.1  Servers
Server mode: Peer to Peer (SSL/TLS)
Protocol: UDP
Device Mode: tun

site B：DD-WRT Clients
Protocol: UDP
Device Mode: tun

After setting, VPN connection fails, the following log appears every one minute:

Sep 7 12:35:45 openvpn 40135 Initialization Sequence Completed
Sep 7 12:35:46 openvpn 40135 send_push_reply(): safe_cap=940
Sep 7 12:36:46 openvpn 40135 [test] Inactivity timeout (–ping-restart), restarting
Sep 7 12:36:46 openvpn 40135 SIGUSR1[soft,ping-restart] received, process restarting
Sep 7 12:36:48 openvpn 40135 NOTE: the current –script-security setting may allow this configuration to call user-defined scripts

Then change the Server mode: Remote Access (SSL / TLS)
VPN can be connected to normal，But can not meet the requirements of the site-to-site

Please help me, thank you