https://devzone.nordicsemi.com/f/nordic-q-a/13699/sending-data-on-notificationHey, I have a problem with sending data on Notification. The problem is data is transmitted in the characteristics even when the notification is not enabled by the app. The topics i wanted anyone to brief is : How to Know that the Android appen-USTelligent Community 13Thu, 12 May 2016 08:12:07 GMThttps://devzone.nordicsemi.com/thread/52357?ContentTypeID=1Thu, 12 May 2016 08:12:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67999f95-0051-45b4-9e39-530529894b3erun_ar<p>If the CCCD is 0x0001 it means notifications has been enabled by the peer and that you can send notifications. You will get a Write event from the softdevice when notifications are enabled.<br /> If the peer didn&#39;t enable notifications and you try to send them anyway, you will get an <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v2.0.0/group___b_l_e___g_a_t_t_s___h_v_x___d_i_s_a_b_l_e_d___m_s_c.html?cp=2_6_2_1_0_2_4_3_2">invalid state error</a>.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52356?ContentTypeID=1Thu, 12 May 2016 07:48:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5116015d-e55e-40ba-b666-2969ae9b369dVijayalakshmi<p>No im not using bonding. and the value of CCCD on master panel is 0x01.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52355?ContentTypeID=1Mon, 09 May 2016 07:55:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a0de796-79b4-4b2d-a263-f7993419c190run_ar<p>There are several examples in our SDK that is using notifications, e.g. Heart rate or UART. Note that sd_ble_gatts_hvx will return an error if you are trying to send notifications and it&#39;s not enabled. Are you sure that you are not using bonding, so the state of the CCCD&#39;s are preserved across connections (with the known device as per spec).</p><div style="clear:both;"></div>