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2019-12-25 00:49:40 -0500	commented answer	ESP32 + rosserial_python over WiFi: Lost sync with device Setting the socket to async mode worked! Thanks ! Since it is non-blocking, it returns with errno 11: EAGAIN continuous
2019-12-25 00:43:51 -0500	marked best answer	ESP32 + rosserial_python over WiFi: Lost sync with device Hi, I am trying to establish rosserial communication between ESP32 (using ESP-IDF and not Arduino framework) and host Ubuntu machine. Here is my implementation: https://github.com/sachin0x18/rosseri... I am using ROS Kinetic and Ubuntu 16.04. rosserial_python version is 0.7.7 (as per package.xml). I can establish communication over UART using `rosrun rosserial_python serial_node.py` and it can recognise publisher and subscriber topics. When I establish communication over WiFi socket using `rosrun rosserial_python serial_node.py tcp`, rosserial_python on my Ubuntu machine can establish a connection and recognise the publisher and subscriber topics but after 15 seconds, it spits out `Lost sync with device, restarting...` and the same thing happens in a loop [INFO] [1565188371.809821]: ROS Serial Python Node Fork_server is: False [INFO] [1565188371.814939]: Waiting for socket connections on port 11411 waiting for socket connection [INFO] [1565188380.808154]: Established a socket connection from 10.0.0.137 on port 49464 [INFO] [1565188380.809062]: calling startSerialClient [INFO] [1565188382.986998]: Note: publish buffer size is 1024 bytes [INFO] [1565188382.989866]: Setup publisher on chatter [std_msgs/String] [ERROR] [1565188397.960632]: Lost sync with device, restarting... [INFO] [1565188398.027021]: Setup publisher on chatter [std_msgs/String] [ERROR] [1565188413.012285]: Lost sync with device, restarting... [INFO] [1565188413.073520]: Setup publisher on chatter [std_msgs/String] I am calling `nh.spinOnce()`every 1 second so it shouldn't be a problem of time sync failure. https://github.com/sachin0x18/rosseri... For debug purpose, I have dumped the bytes that I receive and bytes that I transmit I (3645) event: sta ip: 10.0.0.137, mask: 255.255.254.0, gw: 10.0.0.1 I (3645) wifi station: got ip:10.0.0.137 I (3645) wifi station: Connected to AP I (3735) wifi station: Successfully connected Received at read: 0xff Received at read: 0xfe Received at read: 0x0 Received at read: 0x0 Received at read: 0xff Received at read: 0x0 Received at read: 0x0 Received at read: 0xff I (5955) rosserial: Sending message over ROS 16 I (5965) Sent buffer: ff fe 08 00 f7 0a 00 00 00 00 00 00 00 00 00 f5 \|................\| I (5965) rosserial: Sending message over ROS 80 I (5975) Sent buffer: ff fe 48 00 b7 00 00 7d 00 07 00 00 00 63 68 61 \|..H....}.....cha\| I (5985) Sent buffer: 74 74 65 72 0f 00 00 00 73 74 64 5f 6d 73 67 73 \|tter....std_msgs\| I (5995) Sent buffer: 2f 53 74 72 69 6e 67 20 00 00 00 39 39 32 63 65 \|/String ...992ce\| I (6005) Sent buffer: 38 61 31 36 38 37 63 65 63 38 63 38 62 64 38 38 \|8a1687cec8c8bd88\| I (6015) Sent buffer: 33 65 63 37 33 63 61 34 31 64 31 00 04 00 00 21 \|3ec73ca41d1....!\| I (7025) rosserial: Sending message over ROS 24 I (7025) Sent buffer: ff fe 10 00 ef 7d 00 0c 00 00 00 68 65 6c 6c 6f \|.....}.....hello ... (more)
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2019-08-07 14:33:11 -0500	asked a question	ESP32 + rosserial_python over WiFi: Lost sync with device ESP32 + rosserial_python over WiFi: Lost sync with device Hi, I am trying to establish rosserial communication between