S server for resolution if no errors are present.</li>
<li>ERR_ARG: dns client not initialized or invalid hostname</li>
</ul>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">hostname</td><td>the hostname that is to be queried </td></tr>
    <tr><td class="paramname">addr</td><td>pointer to a ip_addr_t where to store the address if it is already cached in the dns_table (only valid if ERR_OK is returned!) </td></tr>
    <tr><td class="paramname">found</td><td>