https://devzone.nordicsemi.com/f/nordic-q-a/28844/sending-receiving-20b-bleHello guys, My set up is pca10028, s110, sdk 6, tablet with nrf_connect app. I am using modified ble_app_uart example. I was trying to send &gt;20 bytes from nrf_connect app, sniffer only shows &quot;Prepare write request&quot; was sent. My goal is to send anden-USTelligent Community 13Thu, 04 Jan 2018 14:49:00 GMThttps://devzone.nordicsemi.com/thread/114199?ContentTypeID=1Thu, 04 Jan 2018 14:49:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9d328dcb-bb81-4b66-8928-94396dd2832eChocol8<p>Thank you :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/114198?ContentTypeID=1Fri, 29 Dec 2017 14:09:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01d62176-3c16-45b8-9c11-60628b7c3829Hung Bui<p>Hi Chocol,</p> <p>SDK v6 is very old SDK. Which S110 version are you using?</p> <p>Last SDK that supports nRF51 is SDK v12.3.</p> <p>If you want to do queued write (write with longer than 20 bytes) you need to handle it in the application. You can have a look at the message sequence chart <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s110.api.v8.0.0/group___b_l_e___g_a_t_t_s___q_u_e_u_e_d___w_r_i_t_e___b_u_f___n_o_a_u_t_h___m_s_c.html?cp=3_7_0_0_0_2_3_0_6">here</a>.</p> <p>There is an example <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/ble_sdk_app_queued_writes.html?cp=4_0_5_4_2_2_28">here</a>. For older SDK we have an example <a href="https://github.com/NordicPlayground/ble_app_hrs---LongWrite">here</a>.</p><div style="clear:both;"></div>