[tcp] Cannot connect to TCPEchoServ4_DHCP.js again by netcat(echo) on K64F.

[qiaojingx]

Description

When sending single data pack by command echo "hello" | nc <IP address> 4242 to TCPEchoServ4_DHCP.js, connection only can be established first time. No message is print when connect second time. 570:(ERROR) Socket closed early with another in process is outputted when the connect third, forth ... time.

If connect TCPEchoServ4_DHCP.js by nc <IP address> 4242 at the beginning, then disconnect. This issue will not reproduced anymore.

Test Code

TCPEchoServ4_DHCP.js;

Steps to Reproduction

1. make JS=samples/TCPEchoServ4_DHCP.js BOARD=frdm_k64f
2. cp outdir/frdm_k64f/zephyr.bin /media/<username>/MBED/
3. connect FRDM_K64F and PC to a router which assigns a DHCP address
4. send single data pack by netcat: (if connect with nc <IP address> 4242 first, this issue won't occur.)
   echo "hello" | nc <IP address> 4242
5. repeat step 4.

Actual Result

Expected Result

Connection can be established each time.

Test Builds

Branch	Commit Id	Target Device	Test Date	Result
zjs-0.5	ab30ce7 - 4cf09c5	FRDM-K64F	Feb 06, 2018	Fail
zjs-0.5	33112bb	FRDM-K64F	Feb 06, 2018	Pass
master	ede4509	FRDM-K64F	Feb 08, 2018	Fail

Additional Information

This issue is probably caused by #1815 .

[qiaojingx]

Retest with commit ede4509 in master， This issue is also reproduced.

[qiaojingx]

Verified with commit f90d9d1. This issue is not reproduced.
Close.