diff --git a/tests/net/lib/lwm2m/interop/README.md b/tests/net/lib/lwm2m/interop/README.md
index 3acbfcc71f8..28d8e12ccca 100644
--- a/tests/net/lib/lwm2m/interop/README.md
+++ b/tests/net/lib/lwm2m/interop/README.md
@@ -125,6 +125,14 @@ Tests are written from test spec;
 |---------|------|-----|
 |LightweightM2M-1.1-int-0 - Client Initiated Bootstrap                  |:white_check_mark:| |
 |LightweightM2M-1.1-int-1 - Client Initiated Bootstrap Full (PSK)       |:white_check_mark:| |
+|LightweightM2M-1.1-int-2 - Client Initiated Bootstrap Full (Cert)      | |testcase not implemented |
+|LightweightM2M-1.1-int-3 – Simple Bootstrap from Smartcard             |:large_orange_diamond:|We don't have any smartcard support.|
+|LightweightM2M-1.1-int-4 - Bootstrap Delete                            |:white_check_mark:| |
+|LightweightM2M-1.1-int-5 - Server Initiated Bootstrap                  |:white_check_mark:| |
+|LightweightM2M-1.1-int-6 - Bootstrap Sequence                          |:white_check_mark:| |
+|LightweightM2M-1.1-int-7 - Fallback to bootstrap                       |:white_check_mark:| |
+|LightweightM2M-1.1-int-8 - Bootstrap Read | |Test cannot be implemented from client side.|
+|LightweightM2M-1.1-int-9 - Bootstrap and Configuration Consistency     | |testcase not implemented |
 |LightweightM2M-1.1-int-101 - Initial Registration                      |:white_check_mark:| |
 |LightweightM2M-1.1-int-102 - Registration Update                       |:white_check_mark:| |
 |LightweightM2M-1.1-int-103 - Deregistration                            |:large_orange_diamond:|We don't have "disabled" functionality in server object|
diff --git a/tests/net/lib/lwm2m/interop/prj.conf b/tests/net/lib/lwm2m/interop/prj.conf
index 07bd9a0535d..43d4e73f081 100644
--- a/tests/net/lib/lwm2m/interop/prj.conf
+++ b/tests/net/lib/lwm2m/interop/prj.conf
@@ -44,6 +44,11 @@ CONFIG_LWM2M_RW_OMA_TLV_SUPPORT=y
 CONFIG_COAP_EXTENDED_OPTIONS_LEN=y
 CONFIG_COAP_EXTENDED_OPTIONS_LEN_VALUE=40
 
+# Speed up testing, we are running in non-lossy network
+CONFIG_COAP_INIT_ACK_TIMEOUT_MS=1000
+CONFIG_COAP_RANDOMIZE_ACK_TIMEOUT=n
+CONFIG_LWM2M_RD_CLIENT_MAX_RETRIES=2
+
 # Use QUEUE mode by default
 CONFIG_LWM2M_QUEUE_MODE_ENABLED=y
 CONFIG_LWM2M_QUEUE_MODE_UPTIME=20
diff --git a/tests/net/lib/lwm2m/interop/pytest/test_bootstrap.py b/tests/net/lib/lwm2m/interop/pytest/test_bootstrap.py
index 65561db0676..2a45669d912 100644
--- a/tests/net/lib/lwm2m/interop/pytest/test_bootstrap.py
+++ b/tests/net/lib/lwm2m/interop/pytest/test_bootstrap.py
@@ -15,9 +15,11 @@ This module contains only testcases that verify the bootstrap.
 """
 
 import logging
+import pytest
 from leshan import Leshan
 from twister_harness import Shell
 from twister_harness import DeviceAdapter
+from conftest import Endpoint
 
 logger = logging.getLogger(__name__)
 
@@ -29,24 +31,69 @@ logger = logging.getLogger(__name__)
 # Bootstrap Interface: [0-99]
 #
 
-def verify_LightweightM2M_1_1_int_0(shell: Shell, dut: DeviceAdapter):
+def verify_LightweightM2M_1_1_int_0(dut: DeviceAdapter, endpoint_bootstrap: Endpoint):
     """LightweightM2M-1.1-int-0 - Client Initiated Bootstrap"""
-    dut.readlines_until(regex='.*Bootstrap started with endpoint', timeout=5.0)
-    dut.readlines_until(regex='.*Bootstrap registration done', timeout=5.0)
-    dut.readlines_until(regex='.*Bootstrap data transfer done', timeout=5.0)
+    dut.readlines_until(regex='.*Bootstrap transfer complete', timeout=5.0)
+    endpoint_bootstrap.bootstrap = True
 
-def test_LightweightM2M_1_1_int_1(shell: Shell, dut: DeviceAdapter, leshan: Leshan, endpoint_bootstrap: str):
+def test_LightweightM2M_1_1_int_1(shell: Shell, dut: DeviceAdapter, leshan: Leshan, endpoint_bootstrap: Endpoint):
     """LightweightM2M-1.1-int-1 - Client Initiated Bootstrap Full (PSK)"""
-    verify_LightweightM2M_1_1_int_0(shell, dut)
+    verify_LightweightM2M_1_1_int_0(dut, endpoint_bootstrap)
     verify_LightweightM2M_1_1_int_101(shell, dut, leshan, endpoint_bootstrap)
     verify_LightweightM2M_1_1_int_401(shell, leshan, endpoint_bootstrap)
 
-def verify_LightweightM2M_1_1_int_101(shell: Shell, dut: DeviceAdapter, leshan: Leshan, endpoint: str):
+def test_LightweightM2M_1_1_int_4(shell: Shell, dut: DeviceAdapter, leshan: Leshan, endpoint: Endpoint):
+    """LightweightM2M-1.1-int-4 - Bootstrap Delete"""
+    shell.exec_command('lwm2m create 1/2')
+    shell.exec_command('lwm2m read 1/2/0')
+    retval = int(shell.get_filtered_output(shell.exec_command('retval'))[0])
+    assert retval == 0
+    leshan.execute(endpoint, '1/0/9')
+    dut.readlines_until(regex='.*Registration Done', timeout=5.0)
+    shell.exec_command('lwm2m read 1/2/0')
+    retval = int(shell.get_filtered_output(shell.exec_command('retval'))[0])
+    assert retval < 0
+    logger.info('retval: %s', retval)
+
+def test_LightweightM2M_1_1_int_5(dut: DeviceAdapter, leshan: Leshan, endpoint: Endpoint):
+    """LightweightM2M-1.1-int-5 - Server Initiated Bootstrap"""
+    leshan.execute(endpoint, '1/0/9')
+    dut.readlines_until(regex='.*Server Initiated Bootstrap', timeout=1)
+    dut.readlines_until(regex='.*Bootstrap transfer complete', timeout=5.0)
+    dut.readlines_until(regex='.*Registration Done', timeout=5.0)
+
+def test_LightweightM2M_1_1_int_6(shell: Shell, dut: DeviceAdapter, endpoint: Endpoint):
+    """LightweightM2M-1.1-int-6 - Bootstrap Sequence"""
+    shell.exec_command('lwm2m stop')
+    dut.readlines_until(regex=r'.*Deregistration success', timeout=5)
+    shell.exec_command(f'lwm2m start {endpoint}')
+    lines = dut.readlines_until(regex='.*Registration Done', timeout=5.0)
+    assert not any("Bootstrap" in line for line in lines)
+    shell.exec_command('lwm2m stop')
+    dut.readlines_until(regex=r'.*Deregistration success', timeout=5)
+    shell.exec_command("lwm2m delete 1/0")
+    shell.exec_command("lwm2m delete 0/1")
+    shell.exec_command(f'lwm2m start {endpoint}')
+    lines = dut.readlines_until(regex='.*Registration Done', timeout=5.0)
+    assert any("Bootstrap" in line for line in lines)
+
+@pytest.mark.slow
+def test_LightweightM2M_1_1_int_7(shell: Shell, dut: DeviceAdapter, endpoint: Endpoint):
+    """LightweightM2M-1.1-int-7 - Fallback to bootstrap"""
+    shell.exec_command('lwm2m stop')
+    dut.readlines_until(regex=r'.*Deregistration success', timeout=5)
+    shell.exec_command('lwm2m write 0/1/0 -s coaps://10.10.10.10:5684')
+    shell.exec_command(f'lwm2m start {endpoint}')
+    lines = dut.readlines_until(regex='.*Registration Done', timeout=600.0)
+    assert any("Bootstrap" in line for line in lines)
+
+def verify_LightweightM2M_1_1_int_101(shell: Shell, dut: DeviceAdapter, leshan: Leshan, endpoint: Endpoint):
     """LightweightM2M-1.1-int-101 - Initial Registration"""
     dut.readlines_until(regex='.*Registration Done', timeout=5.0)
     assert leshan.get(f'/clients/{endpoint}')
+    endpoint.registered = True
 
-def verify_LightweightM2M_1_1_int_401(shell: Shell, leshan: Leshan, endpoint: str):
+def verify_LightweightM2M_1_1_int_401(shell: Shell, leshan: Leshan, endpoint: Endpoint):
     """LightweightM2M-1.1-int-401 - UDP Channel Security - Pre-shared Key Mode"""
     lines = shell.get_filtered_output(shell.exec_command('lwm2m read 0/0/0 -s'))
     host = lines[0]
diff --git a/tests/net/lib/lwm2m/interop/src/lwm2m-client.c b/tests/net/lib/lwm2m/interop/src/lwm2m-client.c
index b6634069fbd..a150f1b41cb 100644
--- a/tests/net/lib/lwm2m/interop/src/lwm2m-client.c
+++ b/tests/net/lib/lwm2m/interop/src/lwm2m-client.c
@@ -73,6 +73,17 @@ int set_socketoptions(struct lwm2m_ctx *ctx)
 			ret = -errno;
 			LOG_ERR("Failed to enable TLS_DTLS_CID: %d", ret);
 		}
+
+		/* Allow DTLS handshake to timeout much faster.
+		 * these tests run on TUN/TAP network, so there should be no network latency.
+		 */
+		uint32_t min = 100;
+		uint32_t max = 500;
+
+		zsock_setsockopt(ctx->sock_fd, SOL_TLS, TLS_DTLS_HANDSHAKE_TIMEOUT_MIN, &min,
+				 sizeof(min));
+		zsock_setsockopt(ctx->sock_fd, SOL_TLS, TLS_DTLS_HANDSHAKE_TIMEOUT_MAX, &max,
+				 sizeof(max));
 	}
 	return lwm2m_set_default_sockopt(ctx);
 }