使用esp8266，在sta模式下tcp连接遇到这个问题，一直没有找到答案。IPMOD=1是什么问题，
下面是我AT的调试的过程。
ready
WIFI CONNECTED
WIFI GOT IP
AT+CWJAP="RCWIFI","1968087624"
WIFI DISCONNECT
WIFI CONNECTED
WIFI GOT IP
OK
AT+CWMODE=1
OK
AT+CIPMUX=0
OK
AT+CIPSTART="TCP","192.168.1.145",1234
ERROR
CLOSED
AT+CIPSTART="TCP","192.168.1.133",9999
CONNECT
OK
AT+CIPMODE=1
OK
AT+CIFSR
+CIFSR:STAIP,"192.168.1.190"
+CIFSR:STAMAC,"5c:cf:7f:20:4c:b4"
OK
AT+CIPSEND=50
IPMODE=1
ERROR
AT+CIPSEND=50
IPMODE=1
ERROR
AT+CIPSEND=50
IPMODE=1
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