https://devzone.nordicsemi.com/f/nordic-q-a/3546/how-two-way-transmission-of-data-on-nrf518I tried to set a GATT server and a GATT client for each Central and Peripheral, but code exceeds the memory limit. Then i consider to transport by HCI. But I totally confused after watch the sdk document. Does the HCI must work with UART ? In hci_transporten-USTelligent Community 13Thu, 21 Aug 2014 09:29:06 GMThttps://devzone.nordicsemi.com/thread/12839?ContentTypeID=1Thu, 21 Aug 2014 09:29:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e54429f2-9049-4275-926c-6f18f4309541wedl<p>Thanks again !</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/12840?ContentTypeID=1Thu, 21 Aug 2014 08:54:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2119d14-aae4-4abd-b6f6-66c9b44dc5f1Stefan Birnir Sverrisson<p>With nRF51822 and BLE S110 BLE peripheral softdevice (Nordic&#39;s BLE peripheral protocol stack) you can tranmsit max 120 kbps in each direction, see S110 Softdevice Specification v1.3, table 33. Each sent packet can contain maximum 20 bytes of payload data.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/12838?ContentTypeID=1Thu, 21 Aug 2014 03:10:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5cd2ca71-7bda-4ff1-8eff-c231793edb3cwedl<p>Hi Stefan Birnir Sverrisson, thank you for your reply. Now I know how to transport some data between Central and Peripheral. I wonder if there are some limit with Bluetooth data transmission, like data size limit ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/12837?ContentTypeID=1Wed, 20 Aug 2014 13:31:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:821bc006-5315-4a72-9f90-6b92de3e8a90Stefan Birnir Sverrisson<p>What are you actually trying to achieve? Please describe you scenario so I can try to guide you in the right direction. There is an UART with softdevice example available on this path <a href="https://github.com/NordicSemiconductor/nrf51-UART-examples">github.com/.../nrf51-UART-examples</a></p><div style="clear:both;"></div>