IOT项目优化

1，优化ubuntu系统配置

# 增加最大连接数
net.core.somaxconn = 2048
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_max_syn_backlog = 2048

# 快速回收 TIME_WAIT 状态的连接
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1

# 最大文件描述符限制
fs.file-max = 1000000

# 调整本地端口范围
net.ipv4.ip_local_port_range = 1024 65535

# TCP Keepalive 设置（用于长连接保活）
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9

# 提高吞吐量
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216