https://devzone.nordicsemi.com/f/nordic-q-a/62825/config_lte_lock_bands-causes-error-in-nrf-v1-3-0when I add a line below to mqtt_simple program, it causes error. How to fix this? It seems that at_cmd_write in lte_lc.c gives an error -5en-USTelligent Community 13Tue, 23 Jun 2020 06:44:36 GMThttps://devzone.nordicsemi.com/thread/256306?ContentTypeID=1Tue, 23 Jun 2020 06:44:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:12b830d4-33fb-4823-bcb3-8633e0273efbYusuke<p>Sure!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256303?ContentTypeID=1Tue, 23 Jun 2020 06:30:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:748bd313-e281-43f2-adf7-ad6f2f0d72bfMartin Lesund<p>Good to hear.<br />Please let me know if something similar appears again.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256294?ContentTypeID=1Tue, 23 Jun 2020 02:00:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eca7d82e-686e-48bc-8fdd-412c8fdc42c3Yusuke<p>I made a nrf folder from scrach and it seems that the issue is solved.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256243?ContentTypeID=1Mon, 22 Jun 2020 14:30:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2d646a9-5e28-40b0-80f8-fcd56ac9d923Martin Lesund<p>Hi Yusuke,<br />I copied your prj.conf file and ran the sample:<br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-d72393ce416e4241996a10e9541cefaa/pastedimage1592836165469v1.png" alt=" " /></p> <p>it works as expected.<br />Please verify that you are locking available bands in your area.<br /><br />I am running NCS v1.3.0</p> <p>with modem firmware v1.2.0</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256227?ContentTypeID=1Mon, 22 Jun 2020 14:03:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5592a186-a30a-4b3f-ab72-b448d6d77b6dYusuke<p>Can you try mqtt_simple adding the two lines in the same environment?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256224?ContentTypeID=1Mon, 22 Jun 2020 13:59:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4577925b-6c78-4bbd-916b-0694291bca3fYusuke<p>I added these two lines but it gives the same result. no luck..</p> <p><pre class="ui-code" data-mode="text">CONFIG_LTE_LOCK_BANDS=y CONFIG_LTE_LOCK_BAND_MASK=&quot;10000001000000001100&quot;</pre></p> <p>This is the whole prj.conf</p> <p><pre class="ui-code" data-mode="text"># # Copyright (c) 2019 Nordic Semiconductor ASA # # SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic # # Networking CONFIG_NETWORKING=y CONFIG_NET_NATIVE=n CONFIG_NET_SOCKETS_OFFLOAD=y CONFIG_NET_SOCKETS=y CONFIG_NET_SOCKETS_POSIX_NAMES=y # LTE link control CONFIG_LTE_LINK_CONTROL=y CONFIG_LTE_AUTO_INIT_AND_CONNECT=n # BSD library CONFIG_BSD_LIBRARY=y # AT Host CONFIG_UART_INTERRUPT_DRIVEN=y CONFIG_AT_HOST_LIBRARY=y # MQTT CONFIG_MQTT_LIB=y CONFIG_MQTT_LIB_TLS=n # Appliaction #CONFIG_MQTT_PUB_TOPIC=&quot;/my/publish/topic&quot; #CONFIG_MQTT_SUB_TOPIC=&quot;/my/subscribe/topic&quot; #CONFIG_MQTT_CLIENT_ID=&quot;my-client-id&quot; #CONFIG_MQTT_BROKER_HOSTNAME=&quot;mqtt.eclipse.org&quot; #CONFIG_MQTT_BROKER_PORT=1883 # Main thread CONFIG_MAIN_STACK_SIZE=4096 CONFIG_HEAP_MEM_POOL_SIZE=2048 CONFIG_LTE_LOCK_BANDS=y CONFIG_LTE_LOCK_BAND_MASK=&quot;10000001000000001100&quot;</pre></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256202?ContentTypeID=1Mon, 22 Jun 2020 13:26:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6848d90b-a359-4187-9638-af523a0931c1Martin Lesund<p>Hi Yusuke,<br />You also need to set the configuration for<a href="https://github.com/nrfconnect/sdk-nrf/blob/master/lib/lte_link_control/Kconfig#L32" rel="noopener noreferrer" target="_blank"> which bands you want to lock:</a></p> <p><pre class="ui-code" data-mode="text">CONFIG_LTE_LOCK_BAND_MASK=&quot;10000001000000001100&quot;</pre></p><div style="clear:both;"></div>