diff --git a/tools/tiny-test-fw/Utility/Attenuator.py b/tools/tiny-test-fw/Utility/Attenuator.py
new file mode 100644
index 000000000..451c48811
--- /dev/null
+++ b/tools/tiny-test-fw/Utility/Attenuator.py
@@ -0,0 +1,70 @@
+# Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Internal use only.
+
+This file provide method to control programmable attenuator.
+"""
+
+import time
+import serial
+
+
+def set_att(port, att, att_fix=False):
+    """
+    set attenuation value on the attenuator
+
+    :param port: serial port for attenuator
+    :param att: attenuation value we want to set
+    :param att_fix: fix the deviation with experience value
+    :return: True or False
+    """
+
+    assert 0 <= att <= 62
+    # fix att
+    if att_fix:
+        if att >= 33 and (att - 30 + 1) % 4 == 0:
+            att_t = att - 1
+        elif att >= 33 and (att - 30) % 4 == 0:
+            att_t = att + 1
+        else:
+            att_t = att
+    else:
+        att_t = att
+
+    serial_port = serial.Serial(port, baudrate=9600, rtscts=False, timeout=0.1)
+    if serial_port.isOpen() is False:
+        raise IOError("attenuator control, failed to open att port")
+
+    cmd_hex = "7e7e10{:02x}{:x}".format(att_t, 0x10 + att_t)
+    exp_res_hex = "7e7e20{:02x}00{:x}".format(att_t, 0x20 + att_t)
+
+    cmd = cmd_hex.decode("hex")
+    exp_res = exp_res_hex.decode("hex")
+
+    serial_port.write(cmd)
+    res = ""
+
+    for i in range(5):
+        res += serial_port.read(20)
+        if res == exp_res:
+            result = True
+            break
+        time.sleep(0.1)
+    else:
+        result = False
+
+    serial_port.close()
+    return result
diff --git a/tools/tiny-test-fw/Utility/LineChart.py b/tools/tiny-test-fw/Utility/LineChart.py
new file mode 100644
index 000000000..fd5d4b5e6
--- /dev/null
+++ b/tools/tiny-test-fw/Utility/LineChart.py
@@ -0,0 +1,50 @@
+# Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import matplotlib
+# fix can't draw figure with docker
+matplotlib.use('Agg')
+import matplotlib.pyplot as plt
+
+
+# candidate colors
+LINE_STYLE_CANDIDATE = ['b-o', 'r-o', 'k-o', 'm-o', 'c-o', 'g-o', 'y-o',
+                        'b-s', 'r-s', 'k-s', 'm-s', 'c-s', 'g-s', 'y-s']
+
+
+def draw_line_chart(file_name, title, x_label, y_label, data_list):
+    """
+    draw line chart and save to file.
+
+    :param file_name: abs/relative file name to save chart figure
+    :param title: chart title
+    :param x_label: x-axis label
+    :param y_label: y-axis label
+    :param data_list: a list of line data.
+                      each line is a dict of ("x-axis": list, "y-axis": list, "label": string)
+    """
+
+    plt.figure(figsize=(12, 6))
+    plt.grid(True)
+
+    for i, data in enumerate(data_list):
+        plt.plot(data["x-axis"], data["y-axis"], LINE_STYLE_CANDIDATE[i], label=data["label"])
+
+    plt.xlabel(x_label)
+    plt.ylabel(y_label)
+    plt.legend(fontsize=12)
+    plt.title(title)
+    plt.tight_layout(pad=3, w_pad=3, h_pad=3)
+    plt.savefig(file_name)
+    plt.close()
diff --git a/tools/tiny-test-fw/Utility/PowerControl.py b/tools/tiny-test-fw/Utility/PowerControl.py
new file mode 100644
index 000000000..5b7df4c4f
--- /dev/null
+++ b/tools/tiny-test-fw/Utility/PowerControl.py
@@ -0,0 +1,95 @@
+# Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Internal use only.
+
+This file implements controlling  APC PDU via telnet.
+"""
+
+import telnetlib
+
+
+class Control(object):
+    """ control APC via telnet """
+
+    @classmethod
+    def apc_telnet_make_choice(cls, telnet, choice):
+        """ select a choice """
+        telnet.read_until("Event Log")
+        telnet.read_until(">")
+        telnet.write(choice + "\r\n")
+
+    @classmethod
+    def apc_telnet_common_action(cls, telnet, check_str, action):
+        """ wait until a pattern and then write a line """
+        telnet.read_until(check_str)
+        telnet.write(action + "\r\n")
+
+    @classmethod
+    def control(cls, apc_ip, control_dict):
+        """
+        control APC
+
+        :param apc_ip: IP of APC
+        :param control_dict: dict with outlet ID and "ON" or "OFF"
+        """
+
+        for _outlet in control_dict:
+            assert 0 < _outlet < 9
+            assert control_dict[_outlet] in ["ON", "OFF"]
+
+        # telnet
+        # set timeout as 2s so that it won't waste time even can't access APC
+        tn = telnetlib.Telnet(host=apc_ip, timeout=5)
+        # log on
+        cls.apc_telnet_common_action(tn, "User Name :", "apc")
+        cls.apc_telnet_common_action(tn, "Password  :", "apc")
+        # go to Device Manager
+        cls.apc_telnet_make_choice(tn, "1")
+        # go to Outlet Management
+        cls.apc_telnet_make_choice(tn, "2")
+        # go to Outlet Control/Configuration
+        cls.apc_telnet_make_choice(tn, "1")
+
+        # do select Outlet and control
+        for _outlet in control_dict:
+            # choose Outlet
+            cls.apc_telnet_make_choice(tn, str(_outlet))
+            # choose Control Outlet
+            cls.apc_telnet_make_choice(tn, "1")
+            # choose action
+            _action = control_dict[_outlet]
+            if "ON" in _action:
+                cls.apc_telnet_make_choice(tn, "1")
+            else:
+                cls.apc_telnet_make_choice(tn, "2")
+            # do confirm
+            cls.apc_telnet_common_action(tn, "cancel :", "YES")
+            cls.apc_telnet_common_action(tn, "continue...", "")
+            # return to Outlet Control/Configuration
+            cls.apc_telnet_make_choice(tn, "\033")
+            cls.apc_telnet_make_choice(tn, "\033")
+
+        # exit to main menu and logout
+        tn.write("\033\r\n")
+        tn.write("\033\r\n")
+        tn.write("\033\r\n")
+        tn.write("4\r\n")
+
+    @classmethod
+    def control_rest(cls, apc_ip, outlet, action):
+        outlet_list = range(1, 9)
+        outlet_list.remove(outlet)
+        cls.control(apc_ip, dict.fromkeys(outlet_list, action))
diff --git a/tools/tiny-test-fw/docs/index.rst b/tools/tiny-test-fw/docs/index.rst
index 22cfd73a8..bc3a3f5f8 100644
--- a/tools/tiny-test-fw/docs/index.rst
+++ b/tools/tiny-test-fw/docs/index.rst
@@ -129,6 +129,7 @@ The following 3rd party lib is required:
     * pyyaml
     * xunitgen
     * netifaces
+    * matplotlib (if use Utility.LineChart)
 
 To build document, we need to install ``Sphinx`` and ``sphinx-rtd-theme`` (you may replace this with your own theme).