{
    "name": "lwip",
    "config": {
        "ipv4-enabled": {
            "help": "Enable IPv4",
            "value": true
        },
        "ipv6-enabled": {
            "help": "Enable IPv6",
            "value": false
        },
        "ip-ver-pref": {
            "help": "On dual-stack system the preferred stack: 4 for IPv4 and 6 for IPv6",
            "value": 4
        },
        "addr-timeout": {
            "help": "On dual-stack system how long to additionally wait for other stack's address in seconds",
            "value": 5
        },
        "addr-timeout-mode": {
            "help": "Address timeout mode; true: wait both stack's addresses; false: wait for preferred stack's address",
            "value": true
        },
        "ethernet-enabled": {
            "help": "Enable support for Ethernet interfaces",
            "value": true
        },
        "debug-enabled": {
            "help": "Enable debug trace support",
            "value": false
        },
        "ppp-enabled": {
            "help": "Enable support for PPP interfaces",
            "value": false,
            "macro_name": "NSAPI_PPP_AVAILABLE"
        },
        "ppp-ipv4-enabled": {
            "help": "Enable support for ipv4 PPP interface",
            "value": true,
            "macro_name": "NSAPI_PPP_IPV4_AVAILABLE"
        },
        "ppp-ipv6-enabled": {
            "help": "Enable support for ipv6 PPP interface",
            "value": false,
            "macro_name": "NSAPI_PPP_IPV6_AVAILABLE"
        },
        "use-mbed-trace": {
            "help": "Use mbed trace for debug, rather than printf",
            "value": false
        },
        "enable-ppp-trace": {
            "help": "Enable trace support for PPP interfaces",
            "value": false
        },
        "socket-max": {
            "help": "Maximum number of open TCPServer, TCPSocket and UDPSocket instances allowed, including one used internally for DNS.  Each requires 236 bytes of pre-allocated RAM",
            "value": 4
        },
        "tcp-enabled": {
            "help": "Enable TCP",
            "value": true
        },
        "tcp-server-max": {
            "help": "Maximum number of open TCPServer instances allowed.  Each requires 72 bytes of pre-allocated RAM",
            "value": 4
        },
        "tcp-socket-max": {
            "help": "Maximum number of open TCPSocket instances allowed.  Each requires 196 bytes of pre-allocated RAM",
            "value": 4
        },
        "udp-socket-max": {
            "help": "Maximum number of open UDPSocket instances allowed, including one used internally for DNS.  Each requires 84 bytes of pre-allocated RAM",
            "value": 4
        },
        "pbuf-pool-size": {
            "help": "Number of pbufs in pool - usually used for received packets, so this determines how much data can be buffered between reception and the application reading. If a driver uses PBUF_RAM for reception, less pool may be needed. Current default (used if null here) is set to 5 in lwipopts.h, unless overridden by target Ethernet drivers.",
            "value": null
        },
        "pbuf-pool-bufsize": {
            "help": "Size of pbufs in pool. If set to null, lwIP will base the size on the TCP MSS, which is 536 unless overridden by the target",
            "value": null
        },
        "mem-size": {
            "help": "Size of heap (bytes) - used for outgoing packets, and also used by some drivers for reception. Current default (used if null here) is set to 1600 in opt.h, unless overridden by target Ethernet drivers.",
            "value": null
        },
        "tcpip-thread-stacksize": {
            "help": "Stack size for lwip TCPIP thread",
            "value": 1200
        },
        "default-thread-stacksize": {
            "help": "Stack size for lwip system threads",
            "value": 512
        },
        "ppp-thread-stacksize": {
            "help": "Thread stack size for PPP",
            "value": 768
        }
    },
    "target_overrides": {
        "REALTEK_RTL8195AM": {
            "tcpip-thread-stacksize": 1600
        },
        "STM": {
            "mem-size": 25600
        },
        "Freescale": {
            "mem-size": 36560
        },
        "LPC1768": {
            "mem-size": 16362
        },
        "LPC4088": {
            "mem-size": 15360
        },
        "LPC4088_DM": {
            "mem-size": 15360
        },
        "UBLOX_C027": {
            "mem-size": 16362
        },
        "ARCH_PRO": {
            "mem-size": 16362
        },      
        "LPC546XX": {
            "mem-size": 36496
        }
    }
}