Timeout when connecting to a web server thrue a 3G modem

Question

Hi, I have now tested the w5200 curcuit for some time. I have an issue when connection to a WEB server over a 3G modem to send data to a server with http POST. If I post a message from a normal web client, like safari it works. But when I try to connect to the WEB server on the same network it fails to connect If I use an adsl connection it connects both the W5200 and the safari and sends the information correctly. Some setups setIMR(0x07); // Interrupt registers for W5200 setRTR(10000); setRCR(3); openTCPSocketOnPort(1, destinationPort); vTaskDelay(2000); connect(1, destinationIP, destinationPort); vTaskDelay(2000); uint8_t temp = getSn_SR(SOCKET_1); if( temp == SOCK_ESTABLISHED) I am using the interrupt and get’s 08, timeout but with the safari browser it works. I am getting a little desperate here. Can you please send me some hints? Looking forward to a reply JBr

hjjeon0608 · Answer

Hi, jbrandberg. I think you need to capture packets. When connection established, 5200 send SYN packet and receive SYN/ACK packet and send ACK packet. So, check all packet send and receive. Best regards.