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<td class="memname">typedef <a class="el" href="group___g___u_c_s___n_o_d_e___d_i_s_c_o_v_e_r_y___t_y_p_e_s_gae1f89dbd75e3d76917273450df37ff66.html#gae1f89dbd75e3d76917273450df37ff66">Ucs_Nd_CheckResult_t</a>(* Ucs_Nd_EvalCb_t)(<a class="el" href="struct_ucs___signature__t.html">Ucs_Signature_t</a> *signature, void *user_ptr)</td>
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<p>Function signature of node evaluation callback used by Node Discovery service. </p>
<p>The Node Discovery service announces the signature of each node it has found to the application via the evaluation function. In this function the application decides how the Node Discovery service shall proceed with the node. The application maintains two lists:</p>
<dl>
<dt><em>set_list</em> </dt>
<dd><p class="startdd">Contains the signatures of the nodes the system shall contain</p>
<p class="enddd"></p>
</dd>
<dt><em>device_list</em> </dt>
<dd>Contains the signatures of the nodes detected in the system </dd>
</dl>
<p>The evaluation has to follow these rules:</p>
<ul>
<li>If the node is not part of the <em>set_list</em>, it is regarded as unknown (<a class="el" href="group___g___u_c_s___n_o_d_e___d_i_s_c_o_v_e_r_y___t_y_p_e_s_gae1f89dbd75e3d76917273450df37ff66.html#ggae1f89dbd75e3d76917273450df37ff66a4ed7307250366668604925bf3650be4c">UCS_ND_CHK_UNKNOWN</a>) and will be ignored.</li>
<li>If the node is part of the <em>set_list</em> and is not yet in the <em>device_list</em>, the Node Discovery Service shall try to add the node to network (<a class="el" href="group___g___u_c_s___n_o_d_e___d_i_s_c_o_v_e_r_y___t_y_p_e_s_gae1f89dbd75e3d76917273450df37ff66.html#ggae1f89dbd75e3d76917273450df37ff66a0c15fbb8aa9ee8dbf0362b9e9a8b6942">UCS_ND_CHK_WELCOME</a>).</li>
<li>If the node is already part of the <em>device_list</em>, there are two possibilities: the node in the <em>device_list</em> experienced a reset or there are two nodes with the same signature. Evaluation result is <a class="el" href="group___g___u_c_s___n_o_d_e___d_i_s_c_o_v_e_r_y___t_y_p_e_s_gae1f89dbd75e3d76917273450df37ff66.html#ggae1f89dbd75e3d76917273450df37ff66acdbc82cdd701e67cdd7520172767ba75">UCS_ND_CHK_UNIQUE</a>. The Node Discovery service will perform further tests.</li>
</ul>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">signature</td><td>Signature of the respective node </td></tr>
<tr><td class="paramname">user_ptr</td><td>User reference provided in <a class="el" href="struct_ucs___init_data__t.html">Ucs_InitData_t::user_ptr</a> </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>UCS_ND_CHK_WELCOME Node is ok, try to add it to the network. </dd>
<dd>
UCS_ND_CHK_UNIQUE Test if this node is unique. </dd>
<dd>
UCS_ND_CHK_UNKNOWN Node is unknown, no further action. </dd></dl>
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