netty连接硬件网络配置

neety连接硬件,每一分钟发送一次心跳。
linux的/etc/sysctl.conf配置

vm.swappiness = 0
kernel.sysrq = 1

net.ipv4.neigh.default.gc_stale_time = 120

# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2

# see details in https://help.aliyun.com/knowledge_detail/41334.html
#5000 update 262144
net.ipv4.tcp_max_tw_buckets = 262144
net.ipv4.tcp_syncookies = 1
#net.ipv4.tcp_max_syn_backlog = 1024
#net.ipv4.tcp_synack_retries = 2
#net.ipv4.tcp_slow_start_after_idle = 0

# tcp_max_syn_backlog will only take effect when net.ipv4.tcp_syncookies == 0
# # net.ipv4.tcp_max_syn_backlog = 65536
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 10

出现问题 :
28分01秒发送心跳。29分30秒设备断开连接。没有发送一分钟心跳。然后过12分钟后硬件重连。重连后连续发送断开连接之间的心跳包11-12次，每隔几天出现一次,linux操作系统(aarch64)
这个问题如何排查及解决