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 <span id="projectnumber">2.0</span>
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<a href="#define-members">Macros</a> </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga7d4e12d90912d486e64f289d7f3ca446"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga7d4e12d90912d486e64f289d7f3ca446">SNTP_CHECK_RESPONSE</a>   0</td></tr>
<tr class="separator:ga7d4e12d90912d486e64f289d7f3ca446"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga25c6f9c14c17e218d110d826b09f8d91"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga25c6f9c14c17e218d110d826b09f8d91">SNTP_DEBUG</a>   <a class="el" href="group__debugging__levels.html#gadab1cdc3f45939a3a5c9a3d7e04987e1">LWIP_DBG_OFF</a></td></tr>
<tr class="separator:ga25c6f9c14c17e218d110d826b09f8d91"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga961a61eef942ab5378cff1e3742b3ade"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga961a61eef942ab5378cff1e3742b3ade">SNTP_GET_SERVERS_FROM_DHCP</a>   <a class="el" href="group__lwip__opts__dhcp.html#ga2cc18315edcd5ffc083d1256f7d22a83">LWIP_DHCP_GET_NTP_SRV</a></td></tr>
<tr class="separator:ga961a61eef942ab5378cff1e3742b3ade"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab0ea385479a5c5c8c173f165ded2fb63"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gab0ea385479a5c5c8c173f165ded2fb63">SNTP_GET_SYSTEM_TIME</a>(sec, us)   do { (sec) = 0; (us) = 0; } while(0)</td></tr>
<tr class="separator:gab0ea385479a5c5c8c173f165ded2fb63"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5d9dc0827f402849f5c18d44e311dbc2"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga5d9dc0827f402849f5c18d44e311dbc2">SNTP_MAX_SERVERS</a>   <a class="el" href="group__lwip__opts__dhcp.html#ga9d014e3f7dc9e1e7c7decd8652ba65e2">LWIP_DHCP_MAX_NTP_SERVERS</a></td></tr>
<tr class="separator:ga5d9dc0827f402849f5c18d44e311dbc2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gacbee62c27f54371fc2c5259a834a0f9b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gacbee62c27f54371fc2c5259a834a0f9b">SNTP_PORT</a>   123</td></tr>
<tr class="separator:gacbee62c27f54371fc2c5259a834a0f9b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga44cf26b9b19832d88599244711a12d08"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga44cf26b9b19832d88599244711a12d08">SNTP_RECV_TIMEOUT</a>   3000</td></tr>
<tr class="separator:ga44cf26b9b19832d88599244711a12d08"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga86d651d8eb07687208308deef95a23ba"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga86d651d8eb07687208308deef95a23ba">SNTP_RETRY_TIMEOUT</a>   <a class="el" href="group__sntp__opts.html#ga44cf26b9b19832d88599244711a12d08">SNTP_RECV_TIMEOUT</a></td></tr>
<tr class="separator:ga86d651d8eb07687208308deef95a23ba"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafdb7e98f608cc429188d7dac356614c2"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gafdb7e98f608cc429188d7dac356614c2">SNTP_RETRY_TIMEOUT_EXP</a>   1</td></tr>
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<tr class="memitem:gafde10b3ed7cb4bb2cd2c4daa389db699"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gafde10b3ed7cb4bb2cd2c4daa389db699">SNTP_RETRY_TIMEOUT_MAX</a>   (<a class="el" href="group__sntp__opts.html#ga86d651d8eb07687208308deef95a23ba">SNTP_RETRY_TIMEOUT</a> * 10)</td></tr>
<tr class="separator:gafde10b3ed7cb4bb2cd2c4daa389db699"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaef477c145ae404d77188b26b79b6996f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gaef477c145ae404d77188b26b79b6996f">SNTP_SERVER_DNS</a>   0</td></tr>
<tr class="separator:gaef477c145ae404d77188b26b79b6996f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafe340b98c52dedcbc041267fe13b2da6"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gafe340b98c52dedcbc041267fe13b2da6">SNTP_SET_SYSTEM_TIME</a>(sec)   <a class="el" href="group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(sec)</td></tr>
<tr class="separator:gafe340b98c52dedcbc041267fe13b2da6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga22017d43da7d4bf8d42e786b4ced4dfa"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga22017d43da7d4bf8d42e786b4ced4dfa">SNTP_STARTUP_DELAY</a>   0</td></tr>
<tr class="separator:ga22017d43da7d4bf8d42e786b4ced4dfa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae082c2f3044d500ca5e1be1d4928de75"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#gae082c2f3044d500ca5e1be1d4928de75">SNTP_STARTUP_DELAY_FUNC</a>   <a class="el" href="group__sntp__opts.html#ga22017d43da7d4bf8d42e786b4ced4dfa">SNTP_STARTUP_DELAY</a></td></tr>
<tr class="separator:gae082c2f3044d500ca5e1be1d4928de75"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9232c56443115be05a2f852eba21979c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__sntp__opts.html#ga9232c56443115be05a2f852eba21979c">SNTP_UPDATE_DELAY</a>   3600000</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7d4e12d90912d486e64f289d7f3ca446">◆ </a></span>SNTP_CHECK_RESPONSE</h2>
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<td class="memname">#define SNTP_CHECK_RESPONSE   0</td>
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<p>Set this to 1 to allow config of SNTP server(s) by DNS name Sanity check: Define this to</p><ul>
<li>0 to turn off sanity checks (default; smaller code)</li>
<li>>= 1 to check address and port of the response packet to ensure the response comes from the server we sent the request to.</li>
<li>>= 2 to check returned Originate Timestamp against Transmit Timestamp sent to the server (to ensure response to older request).</li>
<li>>= 3 <dl class="todo"><dt><b><a class="el" href="todo.html#_todo000001">Todo:</a></b></dt><dd>: discard reply if any of the LI, Stratum, or Transmit Timestamp fields is 0 or the Mode field is not 4 (unicast) or 5 (broadcast).</dd></dl>
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<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00107">107</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga25c6f9c14c17e218d110d826b09f8d91">◆ </a></span>SNTP_DEBUG</h2>
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<td class="memname">#define SNTP_DEBUG   <a class="el" href="group__debugging__levels.html#gadab1cdc3f45939a3a5c9a3d7e04987e1">LWIP_DBG_OFF</a></td>
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<p>SNTP_DEBUG: Enable debugging for SNTP. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00079">79</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga961a61eef942ab5378cff1e3742b3ade">◆ </a></span>SNTP_GET_SERVERS_FROM_DHCP</h2>
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<td class="memname">#define SNTP_GET_SERVERS_FROM_DHCP   <a class="el" href="group__lwip__opts__dhcp.html#ga2cc18315edcd5ffc083d1256f7d22a83">LWIP_DHCP_GET_NTP_SRV</a></td>
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<p>Set this to 1 to implement the callback function called by dhcp when NTP servers are received. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00064">64</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gab0ea385479a5c5c8c173f165ded2fb63">◆ </a></span>SNTP_GET_SYSTEM_TIME</h2>
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<td class="memname">#define SNTP_GET_SYSTEM_TIME</td>
<td>(</td>
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<td class="paramname">sec, </td>
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<td>)</td>
<td></td><td>   do { (sec) = 0; (us) = 0; } while(0)</td>
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<p>SNTP macro to get system time, used with SNTP_CHECK_RESPONSE >= 2 to send in request and compare in response. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00146">146</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5d9dc0827f402849f5c18d44e311dbc2">◆ </a></span>SNTP_MAX_SERVERS</h2>
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<td class="memname">#define SNTP_MAX_SERVERS   <a class="el" href="group__lwip__opts__dhcp.html#ga9d014e3f7dc9e1e7c7decd8652ba65e2">LWIP_DHCP_MAX_NTP_SERVERS</a></td>
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<p>The maximum number of SNTP servers that can be set </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00058">58</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gacbee62c27f54371fc2c5259a834a0f9b">◆ </a></span>SNTP_PORT</h2>
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<td class="memname">#define SNTP_PORT   123</td>
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<p>SNTP server port </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00084">84</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga44cf26b9b19832d88599244711a12d08">◆ </a></span>SNTP_RECV_TIMEOUT</h2>
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<td class="memname">#define SNTP_RECV_TIMEOUT   3000</td>
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<p>SNTP receive timeout - in milliseconds Also used as retry timeout - this shouldn't be too low. Default is 3 seconds. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00132">132</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga86d651d8eb07687208308deef95a23ba">◆ </a></span>SNTP_RETRY_TIMEOUT</h2>
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<td class="memname">#define SNTP_RETRY_TIMEOUT   <a class="el" href="group__sntp__opts.html#ga44cf26b9b19832d88599244711a12d08">SNTP_RECV_TIMEOUT</a></td>
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<p>Default retry timeout (in milliseconds) if the response received is invalid. This is doubled with each retry until SNTP_RETRY_TIMEOUT_MAX is reached. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00154">154</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gafdb7e98f608cc429188d7dac356614c2">◆ </a></span>SNTP_RETRY_TIMEOUT_EXP</h2>
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<td class="memname">#define SNTP_RETRY_TIMEOUT_EXP   1</td>
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<p>Increase retry timeout with every retry sent Default is on to conform to RFC. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00166">166</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gafde10b3ed7cb4bb2cd2c4daa389db699">◆ </a></span>SNTP_RETRY_TIMEOUT_MAX</h2>
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<td class="memname">#define SNTP_RETRY_TIMEOUT_MAX   (<a class="el" href="group__sntp__opts.html#ga86d651d8eb07687208308deef95a23ba">SNTP_RETRY_TIMEOUT</a> * 10)</td>
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<p>Maximum retry timeout (in milliseconds). </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00159">159</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gaef477c145ae404d77188b26b79b6996f">◆ </a></span>SNTP_SERVER_DNS</h2>
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<td class="memname">#define SNTP_SERVER_DNS   0</td>
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<p>Set this to 1 to support DNS names (or IP address strings) to set sntp servers One server address/name can be defined as default if SNTP_SERVER_DNS == 1: #define SNTP_SERVER_ADDRESS "pool.ntp.org" </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00072">72</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gafe340b98c52dedcbc041267fe13b2da6">◆ </a></span>SNTP_SET_SYSTEM_TIME</h2>
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<td class="memname">#define SNTP_SET_SYSTEM_TIME</td>
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<td>   <a class="el" href="group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(sec)</td>
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<p>SNTP macro to change system time in seconds Define SNTP_SET_SYSTEM_TIME_US(sec, us) to set the time in microseconds instead of this one if you need the additional precision. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00053">53</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga22017d43da7d4bf8d42e786b4ced4dfa">◆ </a></span>SNTP_STARTUP_DELAY</h2>
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<td class="memname">#define SNTP_STARTUP_DELAY   0</td>
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<p>According to the RFC, this shall be a random delay between 1 and 5 minutes (in milliseconds) to prevent load peaks. This can be defined to a random generation function, which must return the delay in milliseconds as u32_t. Turned off by default. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00117">117</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#gae082c2f3044d500ca5e1be1d4928de75">◆ </a></span>SNTP_STARTUP_DELAY_FUNC</h2>
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<td class="memname">#define SNTP_STARTUP_DELAY_FUNC   <a class="el" href="group__sntp__opts.html#ga22017d43da7d4bf8d42e786b4ced4dfa">SNTP_STARTUP_DELAY</a></td>
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<p>If you want the startup delay to be a function, define this to a function (including the brackets) and define SNTP_STARTUP_DELAY to 1. </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00124">124</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9232c56443115be05a2f852eba21979c">◆ </a></span>SNTP_UPDATE_DELAY</h2>
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<td class="memname">#define SNTP_UPDATE_DELAY   3600000</td>
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<p>SNTP update delay - in milliseconds Default is 1 hour. Must not be beolw 15 seconds by specification (i.e. 15000) </p>
<p class="definition">Definition at line <a class="el" href="sntp__opts_8h_source.html#l00139">139</a> of file <a class="el" href="sntp__opts_8h_source.html">sntp_opts.h</a>.</p>
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