https://devzone.nordicsemi.com/f/nordic-q-a/75919/capture-the-hci-messages-using-btmon-via-rpmsgWould like to capture the HCI flow through rpmsg (Rx and TX) using the btmon tool between application and network core. could not successfully do it. Procedure: 1. Build and flashed the samples\bluetooth\hci_rpmsg on Network Core 2. Build and flasheden-USTelligent Community 13Thu, 03 Jun 2021 10:23:36 GMThttps://devzone.nordicsemi.com/thread/313352?ContentTypeID=1Thu, 03 Jun 2021 10:23:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86c5aa89-a104-483c-8e06-1041e13fc839venkatesan.m<p>Thanks it works.</p> <p>The following is used&nbsp; in prj.conf</p> <p>CONFIG_UART_CONSOLE=n<br />CONFIG_BT_DEBUG_MONITOR_UART=y</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/313295?ContentTypeID=1Thu, 03 Jun 2021 07:59:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:669f1aef-85c4-49dd-91f2-b5c533163aa7H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>In the peripheral prj.conf, add these configs:</p> <p><pre class="ui-code" data-mode="text">CONFIG_BT_DEBUG_MONITOR=y CONFIG_UART_CONSOLE=n </pre></p> <p>Then you open the serial port via this command (you want the third com port of the DK, might be different on your PC):</p> <p><pre class="ui-code" data-mode="text">btmon --tty /dev/ttyACM2 --tty-speed 115200</pre></p> <p>And you should see this output:</p> <p><pre class="ui-code" data-mode="text">Bluetooth monitor ver 5.56 --- /dev/ttyACM3 opened --- = New Index: 00:00:00:00:00:00 (Primary,SMD,RPMsg) 0.276800 = Note: *** Booting Zephyr OS build v2.4.99-ncs2 *** 0.279900 = Open Index: 00:00:00:00:00:00 0.287700 &lt; HCI Command: Reset (0x03|0x0003) plen 0 #1 0.288700 = bt: fs_nvs: 2 Sectors of 4096 bytes 0.862900 * Drops: cmd 4 evt 4 acl_tx 0 acl_rx 0 sco_tx 0 sco_rx 0 other 0 = bt: fs_nvs: alloc wra: 0, fc0 0.862900 * Drops: cmd 5 evt 5 acl_tx 0 acl_rx 0 sco_tx 0 sco_rx 0 other 0 &gt; HCI Event: Command Complete (0x0e) plen 4 #2 0.304100 Host Buffer Size (0x03|0x0033) ncmd 1 Status: Success (0x00) &lt; HCI Command: Set Controller To Host Flow Control (0x03|0x0031) plen 1 #3 0.306200 Flow control: ACL Data Packets (0x01) = bt: fs_nvs: data wra: 0, 4c 0.863000 * Drops: cmd 4 evt 4 acl_tx 0 acl_rx 0 sco_tx 0 sco_rx 0 other 0 &gt; HCI Event: Command Complete (0x0e) plen 12 #4 0.312000 LE Read Maximum Data Length (0x08|0x002f) ncmd 1 Status: Success (0x00) Max TX octets: 251 Max TX time: 2704 Max RX octets: 251 Max RX time: 2704 &lt; HCI Command: LE Write Suggested Default Data Length (0x08|0x0024) plen 4 #5 0.314800 TX octets: 251 TX time: 2704 &gt; HCI Event: Command Complete (0x0e) plen 4 #6 0.317200 LE Write Suggested Default Data Length (0x08|0x0024) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Set Resolvable Private Address Timeout (0x08|0x002e) plen 2 #7 0.318800 Timeout: 900 seconds &gt; HCI Event: Command Complete (0x0e) plen 4 #8 0.321000 LE Set Resolvable Private Address Timeout (0x08|0x002e) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Read Resolving List Size (0x08|0x002a) plen 0 #9 0.322600 &gt; HCI Event: Command Complete (0x0e) plen 5 #10 0.324600 LE Read Resolving List Size (0x08|0x002a) ncmd 1 Status: Success (0x00) Size: 8 &lt; HCI Command: LE Set Event Mask (0x08|0x0001) plen 8 #11 0.326300 Mask: 0x0000000000000a5e LE Advertising Report LE Connection Update Complete LE Read Remote Used Features Complete LE Long Term Key Request LE Data Length Change LE Enhanced Connection Complete LE PHY Update Complete &gt; HCI Event: Command Complete (0x0e) plen 4 #12 0.329200 LE Set Event Mask (0x08|0x0001) ncmd 1 Status: Success (0x00) &lt; HCI Command: Set Event Mask (0x03|0x0001) plen 8 #13 0.330800 Mask: 0x2000800002008890 Disconnection Complete Encryption Change Read Remote Version Information Complete Hardware Error Data Buffer Overflow Encryption Key Refresh Complete LE Meta &gt; HCI Event: Command Complete (0x0e) plen 4 #14 0.333500 Set Event Mask (0x03|0x0001) ncmd 1 Status: Success (0x00) &lt; HCI Command: Vendor (0x3f|0x0001) plen 0 #15 0.335100 &gt; HCI Event: Command Complete (0x0e) plen 16 #16 0.337200 Vendor (0x3f|0x0001) ncmd 1 Status: Success (0x00) 02 00 03 00 00 d9 e2 43 71 3b 2d c0 .......Cq;-. &lt; HCI Command: Vendor (0x3f|0x0002) plen 0 #17 0.340000 &gt; HCI Event: Command Complete (0x0e) plen 68 #18 0.342000 Vendor (0x3f|0x0002) ncmd 1 Status: Success (0x00) 23 05 03 00 00 d9 e2 43 71 3b 2d c0 00 00 28 22 #......Cq;-...(&quot; 00 00 00 00 00 00 04 00 00 f7 ff ff 7f 00 00 00 ................ 30 c0 79 fe 01 00 80 04 00 00 00 00 00 00 00 00 0.y............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ = Note: Bluetooth initialized 0.349700 &lt; HCI Command: Read BD ADDR (0x04|0x0009) plen 0 #19 0.353000 &gt; HCI Event: Command Complete (0x0e) plen 10 #20 0.355100 Read BD ADDR (0x04|0x0009) ncmd 1 Status: Success (0x00) Address: 00:00:00:00:00:00 (OUI 00-00-00) &lt; HCI Command: Vendor (0x3f|0x0009) plen 0 #21 0.357300 &gt; HCI Event: Command Complete (0x0e) plen 27 #22 0.359300 Vendor (0x3f|0x0009) ncmd 1 Status: Success (0x00) 01 36 4e 94 4e 1a f9 e5 2b b3 af eb 90 fc 33 0c .6N.N...+.....3. c4 34 60 eb e7 78 b3 .4`..x. &lt; HCI Command: LE Set Random Address (0x08|0x0005) plen 6 #23 0.369100 Address: 68:8C:F8:76:CE:46 (Resolvable) &gt; HCI Event: Command Complete (0x0e) plen 4 #24 0.371700 LE Set Random Address (0x08|0x0005) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Set Advertising Parameters (0x08|0x0006) plen 15 #25 0.373400 Min advertising interval: 100.000 msec (0x00a0) Max advertising interval: 150.000 msec (0x00f0) Type: Connectable undirected - ADV_IND (0x00) Own address type: Random (0x01) Direct address type: Public (0x00) Direct address: 00:00:00:00:00:00 (OUI 00-00-00) Channel map: 37, 38, 39 (0x07) Filter policy: Allow Scan Request from Any, Allow Connect Request from Any (0x00) &gt; HCI Event: Command Complete (0x0e) plen 4 #26 0.376800 LE Set Advertising Parameters (0x08|0x0006) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Set Advertising Data (0x08|0x0008) plen 32 #27 0.378400 Length: 29 Flags: 0x06 LE General Discoverable Mode BR/EDR Not Supported 16-bit Service UUIDs (complete): 3 entries Heart Rate (0x180d) Battery Service (0x180f) Current Time Service (0x1805) 128-bit Service UUIDs (complete): 1 entry Vendor specific (12345678-1234-5678-1234-56789abcdef0) &gt; HCI Event: Command Complete (0x0e) plen 4 #28 0.383500 LE Set Advertising Data (0x08|0x0008) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Set Scan Response Data (0x08|0x0009) plen 32 #29 0.385200 Length: 31 Name (short): Zephyr Peripheral Sample Long &gt; HCI Event: Command Complete (0x0e) plen 4 #30 0.390200 LE Set Scan Response Data (0x08|0x0009) ncmd 1 Status: Success (0x00) &lt; HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1 #31 0.391800 Advertising: Enabled (0x01) &gt; HCI Event: Command Complete (0x0e) plen 4 #32 0.394500 LE Set Advertise Enable (0x08|0x000a) ncmd 1 Status: Success (0x00) = Note: Advertising successfully started 0.396100 = bt: bt_hci_core: HW Platform: Nordic Semiconductor (0x0002) 0.339900 = bt: bt_hci_core: HW Variant: nRF53x (0x0003) 0.340000 = bt: bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 217.17378 Build 3224189809 0.340000 = bt: bt_hci_core: ECC HCI commands not available 0.349700 = bt: bt_hci_core: No ID address. App must call settings_load() 0.349700 = bt: bt_hci_core: Identity: F9:1A:4E:94:4E:36 (random) 0.367300 = bt: bt_hci_core: HCI: version 5.2 (0x0b) revision 0x21c2, manufacturer 0x0059 0.367300 = bt: bt_hci_core: LMP: version 5.2 (0x0b) subver 0x21c2 </pre></p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>