samples: bluetoot: connect directly to 1ms

Instad of connecting to 7.5ms and then changing to 1ms.
Speeds up encryption setup and service discovery by alot.

Signed-off-by: Martin Tverdal <martin.tverdal@nordicsemi.no>

samples/bluetooth/llpm/README.rst

@@ -106,33 +106,32 @@ After programming the sample to both development kits, test it by performing the
 
  - The central outputs the following information::
 
- Press any key to set LLPM short connection connection interval (1 ms)
+ Press any key to start measuring transmission latency
 
  - The peripheral outputs the following information::
 
  Press any key to start measuring transmission latency
 
 #. Press a key in the terminal that is connected to the peripheral.
-#. Observe the terminal connected to the peripheral. The latency measurements are printed in the terminal.
- The latency is expected to be shorter than the default connection interval::
+#. Observe the terminal connected to the peripheral.
+ The latency measurements are printed in the terminal.
+ The latency is expected to be around 1 ms.
 
- Transmission Latency: 80917 (us), CRC mismatches: 0
+ Transmission Latency: 1083 (us), CRC mismatches: 0
 
 #. Press a key in the terminal that is connected to the central.
-#. Observe the connection gets updated to LLPM connection interval (1 ms) on both sides::
-
- Connection interval updated: LLPM (1 ms)
-
 #. Observe the terminal connected to the peripheral.
  The measured latency on the peripheral becomes approximate 1 ms::
 
  Transmission Latency: 1098 (us), CRC mismatches: 0
 
-#. Press a key in the terminal that is connected to the central.
+#. Observe the central switches to standard 7.5 ms interval right after performing latency measurements.
+
 #. Observe the terminal connected to the central.
- The measured latency on the central remains approximate 1 ms::
+ The latency is higher now.
 
- Transmission Latency: 1235 (us), CRC mismatches: 0
+ Connection interval updated: 7.5 ms
+ Transmission Latency: 4592 (us), CRC mismatches: 0
 
 .. msc::
  hscale = "1.3";
@@ -162,99 +161,132 @@ The result should look similar to the following output.
 
 - For the central::
 
- ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****
+ *** Booting Zephyr OS build v3.3.99-ncs1-2858-gc9d01d05ce83 ***
+ Starting Bluetooth LLPM example
+ I: SoftDevice Controller build revision:
+ I: 01 2d a8 d4 0d e5 25 cf |.-....%.
+ I: a3 48 8d 2f 56 e0 59 c8 |.H./V.Y.
+ I: 24 df 3d 58 |$.=X
+ I: HW Platform: Nordic Semiconductor (0x0002)
+ I: HW Variant: nRF52x (0x0002)
+ I: Firmware: Standard Bluetooth controller (0x00) Version 1.43053 Build 635768276
+ I: Identity: FF:FA:56:08:E1:DD (random)
+ I: HCI: version 5.4 (0x0d) revision 0x10b7, manufacturer 0x0059
+ I: LMP: version 5.4 (0x0d) subver 0x10b7
  Bluetooth initialized
  LLPM mode enabled
- Choose device role - type c (central) or p (peripheral): c
+ Choose device role - type c (central) or p (peripheral):
  Central. Starting scanning
  Scanning successfully started
- Connection event reports enabled
- Filter not match. Address: 08:c6:a4:e0:72:e9 (random) connectable: 0
- Filter not match. Address: 13:04:eb:f1:0b:46 (random) connectable: 0
- Filter not match. Address: 2b:74:72:c3:8f:a8 (random) connectable: 0
- Filter not match. Address: 02:ec:f9:bb:ec:27 (random) connectable: 0
- Filter not match. Address: 01:54:cf:d4:31:cd (random) connectable: 0
- Filter not match. Address: 3e:21:91:91:52:82 (random) connectable: 0
- Filter not match. Address: 08:c6:a4:e0:72:e9 (random) connectable: 0
- Filter not match. Address: 37:63:6a:ed:38:e2 (random) connectable: 0
- Filter not match. Address: 56:c6:75:17:80:d8 (random) connectable: 1
- Filters matched. Address: f9:3c:9c:d1:f6:07 (random) connectable: 1
+ Filter does not match. Address: 1F:25:BE:AC:D4:47 (random) connectable: 0
+ Filter does not match. Address: 5E:29:3A:8C:5A:8D (random) connectable: 0
+ Filter does not match. Address: 2C:E8:67:EA:C9:27 (random) connectable: 1
+ Filters matched. Address: C3:06:3D:25:7F:73 (random) connectable: 1
+ Filter does not match. Address: EA:0E:68:82:9D:0C (random) connectable: 1
+ Filter does not match. Address: 1B:CC:D4:7C:9E:31 (random) connectable: 0
  Connected as central
- Conn. interval is 80 units (1.25 ms/unit)
+ Conn. interval is 3329 units (1.25 ms/unit)
+ Security changed: level 2, err: 0
  Service discovery completed
- Press any key to set LLPM short connection interval (1 ms)
  Press any key to start measuring transmission latency
- Connection interval updated: LLPM (1 ms)
- Transmission Latency: 1235 (us), CRC mismatches: 0
- Transmission Latency: 1007 (us), CRC mismatches: 0
- Transmission Latency: 1434 (us), CRC mismatches: 0
- Transmission Latency: 1312 (us), CRC mismatches: 0
- Transmission Latency: 1220 (us), CRC mismatches: 0
- Transmission Latency: 991 (us), CRC mismatches: 0
+ Transmission Latency: 1037 (us), CRC mismatches: 0
+ Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 1342 (us), CRC mismatches: 0
  Transmission Latency: 1419 (us), CRC mismatches: 0
- Transmission Latency: 1281 (us), CRC mismatches: 0
+ Transmission Latency: 961 (us), CRC mismatches: 0
  Transmission Latency: 1052 (us), CRC mismatches: 0
- Transmission Latency: 991 (us), CRC mismatches: 0
- Transmission Latency: 1403 (us), CRC mismatches: 0
  Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 1342 (us), CRC mismatches: 0
+ Transmission Latency: 1419 (us), CRC mismatches: 0
+ Transmission Latency: 961 (us), CRC mismatches: 0
  Transmission Latency: 1052 (us), CRC mismatches: 0
- Transmission Latency: 976 (us), CRC mismatches: 0
- Transmission Latency: 1358 (us), CRC mismatches: 0
- Transmission Latency: 1281 (us), CRC mismatches: 0
+ Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 1342 (us), CRC mismatches: 0
+ Transmission Latency: 1419 (us), CRC mismatches: 0
+ Transmission Latency: 961 (us), CRC mismatches: 0
  Transmission Latency: 1052 (us), CRC mismatches: 0
- Transmission Latency: 976 (us), CRC mismatches: 0
- Transmission Latency: 1358 (us), CRC mismatches: 0
- Transmission Latency: 1281 (us), CRC mismatches: 0
+ Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 1342 (us), CRC mismatches: 0
+ Transmission Latency: 1419 (us), CRC mismatches: 0
+ Transmission Latency: 961 (us), CRC mismatches: 0
  Transmission Latency: 1052 (us), CRC mismatches: 0
- Transmission Latency: 976 (us), CRC mismatches: 0
- Transmission Latency: 1358 (us), CRC mismatches: 0
- Transmission Latency: 1281 (us), CRC mismatches: 0
+ Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 1342 (us), CRC mismatches: 0
+ Transmission Latency: 1419 (us), CRC mismatches: 0
+ Transmission Latency: 961 (us), CRC mismatches: 0
+ Connection interval updated: 7.5 ms
+ Transmission Latency: 1922 (us), CRC mismatches: 0
+ Transmission Latency: 7064 (us), CRC mismatches: 0
+ Transmission Latency: 13244 (us), CRC mismatches: 0
+ Transmission Latency: 4592 (us), CRC mismatches: 0
+ Transmission Latency: 7019 (us), CRC mismatches: 0
+ Transmission Latency: 5691 (us), CRC mismatches: 0
+ Transmission Latency: 4592 (us), CRC mismatches: 0
+ Transmission Latency: 7019 (us), CRC mismatches: 0
+ Transmission Latency: 5706 (us), CRC mismatches: 0
+ Transmission Latency: 4577 (us), CRC mismatches: 0
+ Transmission Latency: 7019 (us), CRC mismatches: 0
+ Transmission Latency: 5706 (us), CRC mismatches: 0
+ Transmission Latency: 4592 (us), CRC mismatches: 0
+ Transmission Latency: 7019 (us), CRC mismatches: 0
+ Transmission Latency: 5691 (us), CRC mismatches: 0
+ Transmission Latency: 4592 (us), CRC mismatches: 0
+ Transmission Latency: 7019 (us), CRC mismatches: 0
+ Transmission Latency: 5706 (us), CRC mismatches: 0
 
 - For the peripheral::
 
- ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****
+ *** Booting Zephyr OS build v3.3.99-ncs1-2858-gc9d01d05ce83 ***
+ Starting Bluetooth LLPM example
+ I: SoftDevice Controller build revision:
+ I: 01 2d a8 d4 0d e5 25 cf |.-....%.
+ I: a3 48 8d 2f 56 e0 59 c8 |.H./V.Y.
+ I: 24 df 3d 58 |$.=X
+ I: HW Platform: Nordic Semiconductor (0x0002)
+ I: HW Variant: nRF52x (0x0002)
+ I: Firmware: Standard Bluetooth controller (0x00) Version 1.43053 Build 635768276
+ I: Identity: C3:06:3D:25:7F:73 (random)
+ I: HCI: version 5.4 (0x0d) revision 0x10b7, manufacturer 0x0059
+ I: LMP: version 5.4 (0x0d) subver 0x10b7
  Bluetooth initialized
  LLPM mode enabled
- Choose device role - type c (central) or p (peripheral): p
- Slave role. Starting advertising
+ Choose device role - type c (central) or p (peripheral):
+ Peripheral. Starting advertising
  Advertising successfully started
  Connection event reports enabled
- Filter not match. Address: 1d:18:b1:84:fd:05 (random) connectable: 0
- Filter not match. Address: 00:92:3f:a6:3f:48 (random) connectable: 0
- Filter not match. Address: 02:ec:f9:bb:ec:27 (random) connectable: 0
- Filter not match. Address: 3e:21:91:91:52:82 (random) connectable: 0
- Filter not match. Address: 08:c6:a4:e0:72:e9 (random) connectable: 0
- Filter not match. Address: 13:04:eb:f1:0b:46 (random) connectable: 0
- Filter not match. Address: cb:01:1a:2d:6e:ae (random) connectable: 1
- Filter not match. Address: 5c:f2:70:c2:3f:9f (random) connectable: 1
+ W: opcode 0x200a status 0x0d
  Connected as peripheral
- Conn. interval is 80 units (1.25 ms/unit)
+ Conn. interval is 3329 units (1.25 ms/unit)
+ W: opcode 0x2032 status 0x3a
+ E: Failed LE Set PHY (-5)
+ Security changed: level 2, err: 0
  Service discovery completed
  Press any key to start measuring transmission latency
- Transmission Latency: 80917 (us), CRC mismatches: 0
- Transmission Latency: 80841 (us), CRC mismatches: 0
- Transmission Latency: 80749 (us), CRC mismatches: 0
- Transmission Latency: 80673 (us), CRC mismatches: 0
- Transmission Latency: 80596 (us), CRC mismatches: 0
- Transmission Latency: 80505 (us), CRC mismatches: 0
- Transmission Latency: 80429 (us), CRC mismatches: 0
- Transmission Latency: 80337 (us), CRC mismatches: 0
- Transmission Latency: 80261 (us), CRC mismatches: 0
- Transmission Latency: 80184 (us), CRC mismatches: 0
- Transmission Latency: 80093 (us), CRC mismatches: 0
- Transmission Latency: 80017 (us), CRC mismatches: 0
- Transmission Latency: 79940 (us), CRC mismatches: 0
- Transmission Latency: 79849 (us), CRC mismatches: 0
- Connection interval updated: LLPM (1 ms)
- Transmission Latency: 81604 (us), CRC mismatches: 0
- Transmission Latency: 30181 (us), CRC mismatches: 0
- Transmission Latency: 1098 (us), CRC mismatches: 0
- Transmission Latency: 1129 (us), CRC mismatches: 0
- Transmission Latency: 1037 (us), CRC mismatches: 0
- Transmission Latency: 930 (us), CRC mismatches: 0
+ Transmission Latency: 1083 (us), CRC mismatches: 0
  Transmission Latency: 1312 (us), CRC mismatches: 0
+ Transmission Latency: 900 (us), CRC mismatches: 0
+ Transmission Latency: 1007 (us), CRC mismatches: 0
+ Transmission Latency: 1052 (us), CRC mismatches: 0
  Transmission Latency: 1083 (us), CRC mismatches: 0
+ Transmission Latency: 1358 (us), CRC mismatches: 0
+ Transmission Latency: 915 (us), CRC mismatches: 0
+ Transmission Latency: 1007 (us), CRC mismatches: 0
+ Transmission Latency: 1052 (us), CRC mismatches: 0
+ Transmission Latency: 1098 (us), CRC mismatches: 0
+ Transmission Latency: 1296 (us), CRC mismatches: 0
+ Transmission Latency: 900 (us), CRC mismatches: 0
  Transmission Latency: 1007 (us), CRC mismatches: 0
+ Connection interval updated: 7.5 ms
+ Transmission Latency: 1052 (us), CRC mismatches: 0
+ Transmission Latency: 7247 (us), CRC mismatches: 0
+ Transmission Latency: 5950 (us), CRC mismatches: 0
+ Transmission Latency: 4867 (us), CRC mismatches: 0
+ Transmission Latency: 7293 (us), CRC mismatches: 0
+ Transmission Latency: 5996 (us), CRC mismatches: 0
+ Transmission Latency: 4913 (us), CRC mismatches: 0
+ Transmission Latency: 7385 (us), CRC mismatches: 0
+ Transmission Latency: 6088 (us), CRC mismatches: 0
+ Transmission Latency: 5004 (us), CRC mismatches: 0
 
 
 Dependencies

samples/bluetooth/llpm/src/main.c

@@ -27,9 +27,9 @@
 
 #define DEVICE_NAME CONFIG_BT_DEVICE_NAME
 #define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
-#define INTERVAL_MIN 0x6  /* 6 units, 7.5 ms */
-#define INTERVAL_MAX 0x6 /* 6 units,  7.5 ms */
-#define INTERVAL_LLPM  0x0D01 /* Proprietary 1 ms */
+#define INTERVAL_MIN  0x6 /* 6 units, 7.5 ms */
+#define INTERVAL_MIN_US 7500 /* 7.5 ms */
+#define INTERVAL_LLPM 0x0D01  /* Proprietary 1 ms */
 #define INTERVAL_LLPM_US 1000
 
 
@@ -39,7 +39,7 @@ static struct bt_conn *default_conn;
 static struct bt_latency latency;
 static struct bt_latency_client latency_client;
 static struct bt_le_conn_param *conn_param =
- BT_LE_CONN_PARAM(INTERVAL_MIN, INTERVAL_MAX, 0, 400);
+ BT_LE_CONN_PARAM(INTERVAL_LLPM, INTERVAL_LLPM, 0, 400);
 static struct bt_conn_info conn_info = {0};
 
 static const struct bt_data ad[] = {
@@ -230,6 +230,9 @@ static void le_param_updated(struct bt_conn *conn, uint16_t interval,
 {
  if (interval == INTERVAL_LLPM) {
  printk("Connection interval updated: LLPM (1 ms)\n");
+ } else {
+ __ASSERT_NO_MSG(interval == INTERVAL_MIN);
+ printk("Connection interval updated: 7.5 ms\n");
  }
 }
 
@@ -259,7 +262,7 @@ static int enable_llpm_mode(void)
  return 0;
 }
 
-static int enable_llpm_short_connection_interval(void)
+static int vs_change_connection_interval(uint16_t interval_us)
 {
  int err;
  struct net_buf *buf;
@@ -283,7 +286,7 @@ static int enable_llpm_short_connection_interval(void)
 
  cmd_conn_update = net_buf_add(buf, sizeof(*cmd_conn_update));
  cmd_conn_update->connection_handle = conn_handle;
- cmd_conn_update->conn_interval_us = INTERVAL_LLPM_US;
+ cmd_conn_update->conn_interval_us = interval_us;
  cmd_conn_update->conn_latency = 0;
  cmd_conn_update->supervision_timeout = 300;
 
@@ -367,25 +370,13 @@ static const struct bt_latency_client_cb latency_client_cb = {
 static void test_run(void)
 {
  int err;
-
  if (!test_ready) {
  /* disconnected while blocking inside _getchar() */
  return;
  }
 
  test_ready = false;
 
- /* Switch to LLPM short connection interval */
- if (conn_info.role == BT_CONN_ROLE_CENTRAL) {
- printk("Press any key to set LLPM short connection interval (1 ms)\n");
- console_getchar();
-
- if (enable_llpm_short_connection_interval()) {
- printk("Enable LLPM short connection interval failed\n");
- return;
- }
- }
-
  printk("Press any key to start measuring transmission latency\n");
  console_getchar();
 
@@ -409,6 +400,27 @@ static void test_run(void)
  }
 
  memset(&llpm_latency, 0, sizeof(llpm_latency));
+ if (conn_info.role == BT_CONN_ROLE_CENTRAL) {
+ static int counter;
+ static uint16_t interval_us = INTERVAL_LLPM_US;
+
+ counter++;
+ /* Arbitrarily chosen number of measurments
+ * to do before switching interval
+ */
+ if (counter == 20) {
+ counter = 0;
+ if (interval_us == INTERVAL_LLPM_US) {
+ interval_us = INTERVAL_MIN_US;
+ } else {
+ interval_us = INTERVAL_LLPM_US;
+ }
+ if (vs_change_connection_interval(interval_us)) {
+ printk("Enable LLPM short connection interval failed\n");
+ return;
+ }
+ }
+ }
  }
 }
 

subsys/bluetooth/controller/Kconfig

@@ -103,6 +103,7 @@ config SYSTEM_WORKQUEUE_STACK_SIZE
 config BT_CTLR_SDC_LLPM
  bool "Enable Low Latency Packet Mode support"
  depends on SOC_SERIES_NRF52X
+ select BT_CONN_PARAM_ANY
  help
  Low Latency Packet Mode (LLPM) is a Nordic proprietary addition
  which lets the application use connection intervals down to 1 ms.