ESP8266回复“SEND FAIL”，几秒后回复“SEND OK”，为什么？

当我使用多个套接字时，我遇到了问题。

这是我的 AT-Parser 的调试（这不是 uart 上的 RAW 通信，但如果你不信任它，我稍后会记录下来：

我宣布向套接字 0 发送 1336 字节
10:44:58 [ESP8266 ] AT CMD[AT+CIPSEND=0,1336] STATEOK[0x81] STATEERR[0x83] tiMEOUT[15000ms]
10:44:58 [ESP8266 ] [TX] LEN[19]

ESP 接受我的请求
10:44:58 [ESP8266 ] [RX] Response received LEN[2]
10:44:58 [ESP8266 ] OK

ESP要求提供数据
10:44:58 [ESP8266 ] Data-Request received
10:44:58 [ESP8266 ] New State OLD[0x50] NEW[0x81]

我传输 1336 字节
10:44:58 [ESP8266 ] [TX] LEN[1336]

Esp 确认，它收到了 1136 个字节
10:44:58 [ESP8266 ] [RX] Response received LEN[15]
10:44:58 [ESP8266 ] Recv 1336 bytes

Esp 给我发送 3872 字节，它来自
10:44:58 [ESP8266 ] Data received SOCKET[4], LENGTH[1452]
10:44:58 [ESP8266 ] Data received SOCKET[4], LENGTH[1452]
10:44:59 [ESP8266 ] Data received SOCKET[4], LENGTH[968]
10:44:59 [ESP8266 ] [RX] Response received LEN[8]

客户端 Socket 4 关闭了连接
10:44:59 [ESP8266 ] 4,CLOSED
10:44:59 [ESP8266 ] Client disconnected! SOCKET[4]
10:44:59 [ESP8266 ] New socket state SOCKET[4] OLD[1] NEW[0]

Esp 告诉我，它无法将我的最后 1336 个字节发送到套接字 0 ？！
10:44:59 [ESP8266 ] [RX] Response received LEN[9]
10:44:59 [ESP8266 ] SEND FAIL

10:44:59 [ESP8266 ] Failed! RESPONSE[SEND FAIL] STATE[0x81] OK[0x82] ERR[0x83]
10:44:59 [ESP8266 ] New State OLD[0x81] NEW[0x83]
10:44:59 [ESP8266 ] New State OLD[0x83] NEW[0x84]

// For recovering purpose, i send an "AT" command, to ensure, that i'm in sync with the AT-Interpreter of the Esp
10:44:59 [ESP8266 ] AT CMD[AT] STATEOK[0x50] STATEERR[0x84] TIMEOUT[50ms]
10:44:59 [ESP8266 ] [TX] LEN[4]

// Now, i receive an answer, that the data were sent successfully! - But i already give it up, due to the privously "SEND FAIL", in fact: the data reached the receiver.
10:44:59 [ESP8266 ] [RX] Response received LEN[7]
10:44:59 [ESP8266 ] SEND OK
10:44:59 [ESP8266 ] Ignored[SEND OK]!

Esp 对我的最后一个 AT 请求回答了“确定”。
10:44:59 [ESP8266 ] [RX] Response received LEN[2]
10:44:59 [ESP8266 ] OK

这是 AT 固件中的错误吗？- 我能做些什么来解决这个问题？
在我当前的实现中，我第二次传输失败的包。结果，该包裹两次到达收货人处。