esp_websocket_client: Add websocket client component

Closes https://github.com/espressif/esp-idf/issues/2829


* Original commit: espressif/esp-idf@2a2d932cfe

examples/protocols/websocket/example_test.py

@@ -0,0 +1,41 @@
+import re
+import os
+import sys
+import IDF
+
+# this is a test case write with tiny-test-fw.
+# to run test cases outside tiny-test-fw,
+# we need to set environment variable `TEST_FW_PATH`,
+# then get and insert `TEST_FW_PATH` to sys path before import FW module
+test_fw_path = os.getenv("TEST_FW_PATH")
+if test_fw_path and test_fw_path not in sys.path:
+    sys.path.insert(0, test_fw_path)
+
+
+@IDF.idf_example_test(env_tag="Example_WIFI", ignore=True)
+def test_examples_protocol_websocket(env, extra_data):
+    """
+    steps: |
+      1. join AP
+      2. connect to ws://echo.websocket.org
+      3. send and receive data
+    """
+    dut1 = env.get_dut("websocket", "examples/protocols/websocket")
+    # check and log bin size
+    binary_file = os.path.join(dut1.app.binary_path, "websocket-example.bin")
+    bin_size = os.path.getsize(binary_file)
+    IDF.log_performance("websocket_bin_size", "{}KB".format(bin_size // 1024))
+    IDF.check_performance("websocket_bin_size", bin_size // 1024)
+    # start test
+    dut1.start_app()
+    dut1.expect("Waiting for wifi ...")
+    dut1.expect("Connection established...", timeout=30)
+    dut1.expect("WEBSOCKET_EVENT_CONNECTED")
+    for i in range(0, 10):
+        dut1.expect(re.compile(r"Sending hello (\d)"))
+        dut1.expect(re.compile(r"Received=hello (\d)"))
+    dut1.expect("Websocket Stopped")
+
+
+if __name__ == '__main__':
+    test_examples_protocol_websocket()