IPsec VPN server shows no IKE config found

Dear Forum, I was trying to setup an IPsec VPN on my OpenWrt SNAPSHOT r10899-1c0290c5cc / LuCI build running on Linksys WRT3200ACM.

I took a shorcut by installed the Luci-app-ipsec-server from this post

after I fillup the template, and starts the IPsec service, it seems to be alright.

by checking 'Ipsec statusall' I got

Status of IKE charon daemon (strongSwan 5.8.0, Linux 4.19.69, armv7l):
  uptime: 53 minutes, since Sep 24 19:48:49 2019
  worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, scheduled: 0
  loaded plugins: charon aes sha1 random nonce x509 pubkey gmp xcbc hmac kernel-netlink socket-default stroke updown xauth-generic
Listening IP addresses:
  192.168.1.1
  2001:f40:909:6d51::1
  202.187.25.178
  2001:f40:918::3:59e3
  192.168.196.150
Connections:
Security Associations (0 up, 0 connecting):
  none

then, I stated to use Iphone to connect the server

the system log says

Tue Sep 24 19:49:11 2019 daemon.info : 08[NET] received packet: from 192.168.1.116[500] to 192.168.1.1[500] (848 bytes)
Tue Sep 24 19:49:11 2019 daemon.info : 08[ENC] parsed ID_PROT request 0 [ SA V V V V V V V V V V V V V V ]
Tue Sep 24 19:49:11 2019 daemon.info : 08[IKE] no IKE config found for 192.168.1.1...192.168.1.116, sending NO_PROPOSAL_CHOSEN
Tue Sep 24 19:49:11 2019 daemon.info : 08[ENC] generating INFORMATIONAL_V1 request 2213385896 [ N(NO_PROP) ]
Tue Sep 24 19:49:11 2019 daemon.info : 08[NET] sending packet: from 192.168.1.1[500] to 192.168.1.116[500] (40 bytes)
Tue Sep 24 19:49:15 2019 daemon.info : 09[NET] received packet: from 192.168.1.116[500] to 192.168.1.1[500] (848 bytes)
Tue Sep 24 19:49:15 2019 daemon.info : 09[ENC] parsed ID_PROT request 0 [ SA V V V V V V V V V V V V V V ]
Tue Sep 24 19:49:15 2019 daemon.info : 09[IKE] no IKE config found for 192.168.1.1...192.168.1.116, sending NO_PROPOSAL_CHOSEN
Tue Sep 24 19:49:15 2019 daemon.info : 09[ENC] generating INFORMATIONAL_V1 request 1857652229 [ N(NO_PROP) ]
Tue Sep 24 19:49:15 2019 daemon.info : 09[NET] sending packet: from 192.168.1.1[500] to 192.168.1.116[500] (40 bytes)
Tue Sep 24 19:49:18 2019 daemon.info : 10[NET] received packet: from 192.168.1.116[500] to 192.168.1.1[500] (848 bytes)
Tue Sep 24 19:49:18 2019 daemon.info : 10[ENC] parsed ID_PROT request 0 [ SA V V V V V V V V V V V V V V ]
Tue Sep 24 19:49:18 2019 daemon.info : 10[IKE] no IKE config found for 192.168.1.1...192.168.1.116, sending NO_PROPOSAL_CHOSEN
Tue Sep 24 19:49:18 2019 daemon.info : 10[ENC] generating INFORMATIONAL_V1 request 1773004475 [ N(NO_PROP) ]
Tue Sep 24 19:49:18 2019 daemon.info : 10[NET] sending packet: from 192.168.1.1[500] to 192.168.1.116[500] (40 bytes)

/etc/ipsec.conf likes quite empty, I dount this might be the problem.

# ipsec.conf - strongSwan IPsec configuration file

# basic configuration

config setup
	# strictcrlpolicy=yes
	# uniqueids = no

# Add connections here.

# Sample VPN connections

#conn sample-self-signed
#      leftsubnet=10.1.0.0/16
#      leftcert=selfCert.der
#      leftsendcert=never
#      right=192.168.0.2
#      rightsubnet=10.2.0.0/16
#      rightcert=peerCert.der
#      auto=start

#conn sample-with-ca-cert
#      leftsubnet=10.1.0.0/16
#      leftcert=myCert.pem
#      right=192.168.0.2
#      rightsubnet=10.2.0.0/16
#      rightid="C=CH, O=Linux strongSwan CN=peer name"
#      auto=start

firewall settings(trimmed) are as follows:

config redirect
	option target 'DNAT'
	option proto 'tcp udp'
	option src 'wan'
	option dest 'lan'
	option dest_ip '192.168.1.1'
	option name 'IPsec Server'
	option src_dport '500'
	option dest_port '500'

config include 'ipsecd'
	option type 'script'
	option path '/etc/ipsec.include'
	option reload '1'

config rule
	option dest_port '500'
	option src 'wan'
	option name 'ike'
	option target 'ACCEPT'
	option proto 'udp'

config rule
	option dest_port '4500'
	option src 'wan'
	option name 'ipsec'
	option target 'ACCEPT'
	option proto 'udp'

config rule
	option target 'ACCEPT'
	option src 'wan'
	option name 'ah'
	option proto 'ah'

config rule
	option target 'ACCEPT'
	option src 'wan'
	option name 'esp'
	option proto 'esp'

can anyone expert could help....