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Re: [lwip-users] SNTP client does not work

From: Karl Karpfen
Subject: Re: [lwip-users] SNTP client does not work
Date: Mon, 9 Feb 2015 08:33:21 +0100

Hi Sylvain,

now that it is working it is not really a problem for me. But that's what I have seen:

in lwiplib.c / lwIPInit() there is a statement

if(lwipIf->ipMode == IPADDR_USE_STATIC)
    ip_addr.addr = htonl(lwipIf->ipAddr);
    net_mask.addr = htonl(lwipIf->netMask);
    gw_addr.addr = htonl(lwipIf->gwAddr);

which seems to be responsible for exchanging the byteorder.

udp_sendto() of the SNTP-code does not seem to do something similar. So that could explain why both behave that different.


2015-02-06 15:08 GMT+01:00 Sylvain Rochet <address@hidden>:
Hello Karl,

On Fri, Feb 06, 2015 at 08:57:06AM +0100, Karl Karpfen wrote:
> 2015-02-03 15:24 GMT+01:00 Simon Goldschmidt <address@hidden>:
> > Karl Karpfen wrote:
> >
> > There's nothing strange here: the contents of ip_addr_t needs to be in
> > network byte order and the sntp client calls a function that returns the
> > correct byte order.
> OK, to clarify that: to get the ip_addr_t that is used to configure my
> network interface I have to do the following for IP, gateway and netmask:
>     ipaddr_aton(c, &globalConfig.ip);
>     globalConfig.ip.addr=htonl(globalConfig.ip.addr);

Something is wrong in your setup/port/whatever, what I have is:

ipaddr_aton((char*)linebuf, &config.ethernet.address4);
ipaddr_aton((char*)linebuf, &config.ethernet.netmask4);
ipaddr_aton((char*)linebuf, &config.ethernet.gateway4);
netif_add(&MACB_if, &config.ethernet.address4, &config.ethernet.netmask4, &config.ethernet.gateway4, NULL, ethernetif_init, tcpip_input);

Could you dig deeper into your issue finding the root cause of the
problem ?


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