add support ota

hc

2023-02-18 a08c8b75ee83d7f62c9aefc23bfb42082aa4076c

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service tftp
{
    disable        = no
    socket_type    = dgram
    port           = 69
    protocol       = udp
    wait           = yes
    user           = nobody
    server         = /usr/sbin/in.tftpd
    server_args    = /tftpboot
}