https://devzone.nordicsemi.com/f/nordic-q-a/7860/writing-to-peripheral-0-packets-sentHi, i&#39;m using s130 central/peripheral. I want to send data from my central nrf51822 to my peripheral nrf51822. I declare write function like this: static void writeChar (uint16_t peripheral_id,uint8_t *zelVrednost) { uint32_t error_code =en-USTelligent Community 13Fri, 26 Jun 2015 11:20:18 GMThttps://devzone.nordicsemi.com/thread/28020?ContentTypeID=1Fri, 26 Jun 2015 11:20:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:469cbb12-3d21-4fc6-99f3-13fb0e2d17a5nejcokle<p>Figured it out. I declared the size wrong. I used:</p> <pre><code>write_params.len = sizeof(zelVrednost); </code></pre> <p>instead of:</p> <pre><code>write_params.len = sizeof(*zelVrednost); </code></pre> <p>everything works perfect now.</p><div style="clear:both;"></div>