diff --git a/09-coap/test_spec09.py b/09-coap/test_spec09.py
index 55fbc01..ab3251b 100644
--- a/09-coap/test_spec09.py
+++ b/09-coap/test_spec09.py
@@ -36,7 +36,7 @@ def coap_get(
         cmd = "coap get "
         if confirmable:
             cmd += "-c "
-        cmd += f"[{addr}]:{port:d} {resource}"
+        cmd += f"coap://[{addr}]:{port:d}{resource}"
         return self.cmd(cmd, timeout=timeout, async_=async_)
 
 
diff --git a/conftest.py b/conftest.py
index 62b7545..f40a3fc 100644
--- a/conftest.py
+++ b/conftest.py
@@ -6,6 +6,7 @@
 See https://docs.pytest.org/en/stable/fixture.html#conftest-py-sharing-fixture-functions
 """  # noqa: E501
 
+import random
 import re
 import os
 import subprocess
@@ -29,6 +30,7 @@
 RIOTBASE = os.environ.get('RIOTBASE')
 RUNNING_CTRLS = []
 RUNNING_EXPERIMENTS = []
+DEFAULT_PAN_ID = str(random.randint(0, 0xFFFD))
 
 
 def pytest_addoption(parser):
@@ -279,6 +281,10 @@ def nodes(local, request, boards, iotlab_site):
     for board in boards:
         if local or only_native or IoTLABExperiment.valid_board(board):
             env = {'BOARD': f'{board}'}
+            if only_native:
+                # XXX this does not work for a mix of native and non-native boards,
+                # but we do not have these in the release tests at the moment.
+                env["RIOT_TERMINAL"] = "native"
         else:
             env = {
                 'BOARD': IoTLABExperiment.board_from_iotlab_node(board),
@@ -317,6 +323,12 @@ def update_env(node, modules=None, cflags=None, port=None, termflags=None, extra
             node.env.get('DOCKER_ENVIRONMENT_CMDLINE', '')
             + f" -e 'USEMODULE={node.env['USEMODULE']}'"
         )
+    node.env['DEFAULT_PAN_ID'] = DEFAULT_PAN_ID
+    if os.environ.get('BUILD_IN_DOCKER', 0) == '1':
+        node.env['DOCKER_ENVIRONMENT_CMDLINE'] = (
+            node.env.get('DOCKER_ENVIRONMENT_CMDLINE', '')
+            + f" -e 'DEFAULT_PAN_ID={node.env['DEFAULT_PAN_ID']}'"
+        )
     if cflags is not None:
         node.env['CFLAGS'] = cflags
     if port is not None:
diff --git a/requirements.txt b/requirements.txt
index e71cc56..281ef21 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,4 +10,4 @@ pytest-cov
 pytest-rerunfailures
 riotctrl
 scapy
-paho-mqtt
+paho-mqtt<2
diff --git a/testutils/github.py b/testutils/github.py
index d59761c..1b81f26 100644
--- a/testutils/github.py
+++ b/testutils/github.py
@@ -4,7 +4,7 @@
 import urllib.parse
 
 from bs4 import BeautifulSoup
-from github import Github, GithubException, InputFileContent
+from github import Auth, Github, GithubException, InputFileContent
 
 from testutils.git import Git, GitError
 
@@ -80,7 +80,7 @@ def get_github():
     access_token = get_access_token()
     if not access_token:
         return None
-    return Github(access_token, base_url=API_URL)
+    return Github(auth=Auth.Token(access_token), base_url=API_URL)
 
 
 def get_repo(github):
@@ -210,9 +210,9 @@ def create_comment(github, issue):
 def _generate_outcome_summary(pytest_report, task):
     # pylint: disable=C0209
     return "<strong>{a_open}{outcome}{a_close}</strong>".format(
-        a_open='<a href="{}">'.format(task["outcome_url"])
-        if "outcome_url" in task
-        else '',
+        a_open=(
+            '<a href="{}">'.format(task["outcome_url"]) if "outcome_url" in task else ''
+        ),
         outcome=pytest_report.outcome.upper(),
         a_close='</a>' if "outcome_url" in task else '',
     )
diff --git a/testutils/tests/test_github.py b/testutils/tests/test_github.py
index 824abe2..f6157dd 100644
--- a/testutils/tests/test_github.py
+++ b/testutils/tests/test_github.py
@@ -134,8 +134,7 @@ def __init__(self, issues):
 
         # pylint: disable=W0613
         def get_issues(self, *args, **kwargs):
-            for issue in self.issues:
-                yield issue
+            yield from self.issues
 
     issues = [MockIssue(title) for title in issue_titles]
     repo = MockRepo(issues)
@@ -983,9 +982,11 @@ def test_upload_results(
     monkeypatch.setattr(
         testutils.github,
         "get_results_gist",
-        lambda *args, **kwargs: (testutils.github.Git('.'), "", "the_gist_id")
-        if gist_created
-        else (None, None, None),
+        lambda *args, **kwargs: (
+            (testutils.github.Git('.'), "", "the_gist_id")
+            if gist_created
+            else (None, None, None)
+        ),
     )
     monkeypatch.setattr(
         testutils.github, "upload_result_content", lambda *args, **kwargs: head