add jetbot server app

jetbot_app.py

@@ -0,0 +1,76 @@
+from flask import Flask, Response, request, jsonify
+from flask_cors import CORS
+import cv2
+import time
+from jetbot import Robot,Camera, bgr8_to_jpeg
+
+app = Flask(__name__)
+CORS(app)
+robot = Robot()
+camera = Camera.instance()
+
+def generate_frames():
+ while True:
+ frame = camera.value
+ _, buffer = cv2.imencode('.jpg', frame)
+ frame = buffer.tobytes()
+ yield (b'--frame\r\n'
+ b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')
+
+
+@app.route('/capture')
+def capture():
+ frame = camera.value # Capture frame-by-frame
+ _, buffer = cv2.imencode('.jpg', frame)
+ return Response(buffer.tobytes(), mimetype='image/jpeg')
+
+
+@app.route('/video_feed')
+def video_feed():
+ return Response(generate_frames(), 
+ mimetype='multipart/x-mixed-replace; boundary=frame')
+
+
+@app.route('/move_forward', methods=['POST'])
+def move_forward():
+ speed = float(request.json.get('speed', 0.3))
+ duration = float(request.json.get('time', 0.5))
+ robot.forward(speed)
+ time.sleep(duration)
+ robot.stop()
+ return jsonify({'status': 'moved forward'})
+
+@app.route('/move_backward', methods=['POST'])
+def move_backward():
+ speed = float(request.json.get('speed', 0.3))
+ duration = float(request.json.get('time', 0.5))
+ robot.backward(speed)
+ time.sleep(duration)
+ robot.stop()
+ return jsonify({'status': 'moved backward'})
+
+@app.route('/turn_left', methods=['POST'])
+def turn_left():
+ speed = float(request.json.get('speed', 0.3))
+ duration = float(request.json.get('time', 0.5))
+ robot.left(speed)
+ time.sleep(duration)
+ robot.stop()
+ return jsonify({'status': 'turned left'})
+
+@app.route('/turn_right', methods=['POST'])
+def turn_right():
+ speed = float(request.json.get('speed', 0.3))
+ duration = float(request.json.get('time', 0.5))
+ robot.right(speed)
+ time.sleep(duration)
+ robot.stop()
+ return jsonify({'status': 'turned right'})
+
+@app.route('/stop', methods=['GET'])
+def stop():
+ robot.stop()
+ return jsonify({'status': 'stopped'})
+
+if __name__ == '__main__':
+ app.run(host='0.0.0.0', port=5000, threaded=True)