diff --git a/mocks/gc.py b/mocks/gc.py
new file mode 100644
index 000000000..05eb378a3
--- /dev/null
+++ b/mocks/gc.py
@@ -0,0 +1,14 @@
+def enable():
+    pass
+
+def disable():
+    pass
+
+def collect():
+    pass
+
+def mem_alloc():
+    pass
+
+def mem_free():
+    pass
diff --git a/mocks/machine.py b/mocks/machine.py
new file mode 100644
index 000000000..978816216
--- /dev/null
+++ b/mocks/machine.py
@@ -0,0 +1,41 @@
+def reset():
+    pass
+
+def reset_cause():
+    pass
+
+def disable_irq():
+    pass
+
+def enable_irq(state):
+    pass
+
+def freq():
+    pass
+
+def idle():
+    pass
+
+def sleep():
+    pass
+
+def deepsleep():
+    pass
+
+def unique_id():
+    pass
+
+def time_pulse_us(pin, pulse_level, timeout_us=1000000):
+    pass
+
+IDLE = 0
+SLEEP = 0
+DEEPSLEEP = 0
+PWRON_RESET = 0
+HARD_RESET = 0
+WDT_RESET = 0
+DEEPSLEEP_RESET = 0
+SOFT_RESET = 0
+WLAN_WAKE = 0
+PIN_WAKE = 0
+RTC_WAKE = 0
diff --git a/mocks/micropython.py b/mocks/micropython.py
new file mode 100644
index 000000000..51f7c480c
--- /dev/null
+++ b/mocks/micropython.py
@@ -0,0 +1,9 @@
+def mem_info(verbose=None):
+    pass
+
+def qstr_info(verbose=None):
+    pass
+
+def alloc_emergency_exception_buf(size):
+    pass
+
diff --git a/mocks/sys.py b/mocks/sys.py
new file mode 100644
index 000000000..c387cc7e3
--- /dev/null
+++ b/mocks/sys.py
@@ -0,0 +1,18 @@
+def exit(retval=0):
+    pass
+
+def print_exception(exc, file=None):
+    pass
+
+argv = []
+byteorder = None
+implementation = None
+maxsize = None
+modules = []
+path = []
+platform = 'mock'
+stderr = None
+stdin = None
+stdout = None
+version = 'mock-version'
+version_info = (0, 0, 0)
diff --git a/mocks/ubinascii.py b/mocks/ubinascii.py
new file mode 100644
index 000000000..79280af45
--- /dev/null
+++ b/mocks/ubinascii.py
@@ -0,0 +1,11 @@
+def hexlify(data, sep=None):
+    pass
+
+def unhexlify(data):
+    pass
+
+def a2b_base64(data):
+    pass
+
+def b2a_base64(data):
+    pass
diff --git a/mocks/uheapq.py b/mocks/uheapq.py
new file mode 100644
index 000000000..e6f0a0f17
--- /dev/null
+++ b/mocks/uheapq.py
@@ -0,0 +1,8 @@
+def heappush(heap, item):
+    pass
+
+def heappop(heap):
+    pass
+
+def heapify(x):
+    pass
diff --git a/mocks/uio.py b/mocks/uio.py
new file mode 100644
index 000000000..65145b05a
--- /dev/null
+++ b/mocks/uio.py
@@ -0,0 +1,19 @@
+def open(name, mode='r', **kwargs):
+    pass
+
+class FileIO:
+    pass
+
+class TextIOWrapper:
+    pass
+
+class StringIO:
+    def __init__(string):
+        pass
+
+class BytesIO:
+    def __init__(string):
+        pass
+
+    def getvalue():
+        pass
diff --git a/mocks/ustruct.py b/mocks/ustruct.py
new file mode 100644
index 000000000..aae1e50ff
--- /dev/null
+++ b/mocks/ustruct.py
@@ -0,0 +1,14 @@
+def calcsize(fmt):
+    pass
+
+def pack(fmt, *args):
+    pass
+
+def pack_info(fmt, buffer, offset, *args):
+    pass
+
+def unpack(fmt, data):
+    pass
+
+def unpack_from(fmt, data, offset=0):
+    pass
diff --git a/mocks/utime.py b/mocks/utime.py
new file mode 100644
index 000000000..ad30d7cf7
--- /dev/null
+++ b/mocks/utime.py
@@ -0,0 +1,32 @@
+def localtime(secs=None):
+    pass
+
+def ticks_ms():
+    pass
+
+def mktime():
+    pass
+
+def sleep(seconds):
+    pass
+
+def sleep_ms(ms):
+    pass
+
+def sleep_us(us):
+    pass
+
+def ticks_ms():
+    pass
+
+def ticks_us():
+    pass
+
+def ticks_cpu():
+    pass
+
+def ticks_diff(old, new):
+    pass
+
+def time():
+    pass
diff --git a/mocks/uzlib.py b/mocks/uzlib.py
new file mode 100644
index 000000000..7dfce11e3
--- /dev/null
+++ b/mocks/uzlib.py
@@ -0,0 +1,2 @@
+def decompress(data):
+    pass