https://devzone.nordicsemi.com/f/nordic-q-a/47218/continuously-package-send-on-uartDear , I am using nrf 9160 DK, and trying to send a package of data to UART. For example my package is: &quot;LONGITUDEx:10.123456,LATITUDE:59.012324,UTC:20190513095612&quot; I tried to use: uart_fifo_fill(struct device *dev, const u8_t *tx_data, inten-USTelligent Community 13Wed, 15 May 2019 22:32:03 GMThttps://devzone.nordicsemi.com/thread/187373?ContentTypeID=1Wed, 15 May 2019 22:32:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:36366a22-90c4-4f73-88ba-2724777a0607Sigurd<p>Hi,</p> [quote userid="77638" url="~/f/nordic-q-a/47218/continuously-package-send-on-uart"]But I got the problem, the package is too long ( longer than u8_t ?!), so i just send 32bytes [/quote] <p>32 bytes is the default configured value of the UART RAM buffer. You can increase it by setting&nbsp;<span>CONFIG_UART_2_NRF_TX_BUFFER_SIZE to a higher value in your prj.conf file. E.g.:</span></p> <p><span>CONFIG_UART_2_NRF_TX_BUFFER_SIZE=100</span></p> <p><span> See <a href="https://docs.zephyrproject.org/latest/reference/kconfig/CONFIG_UART_2_NRF_TX_BUFFER_SIZE.html">this page</a>. (TXD.MAXCNT on nRF9160 is&nbsp;0x1FFF, see <a href="https://infocenter.nordicsemi.com/topic/ps_nrf9160/uarte.html?cp=2_0_0_5_18_8_47#register.TXD.MAXCNT">this page</a>)&nbsp;</span></p><div style="clear:both;"></div>