1.中文环境：
SDK：ESP8266_NONOS_SDK-2.2.0
文档：ESP8266 Non-OS SDK API 参考 版本 2.2 版权 © 2018
2.文档原文：
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功能
连接 TCP server（ESP8266 作为 TCP client）。
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注意
• 如果 espconn_connect 失败，返回⾮非零值，连接未建⽴立，不不会进⼊入任何 espconn callback。
• 建议使⽤用 espconn_port 接⼝口，设置⼀一个可⽤用的端⼝口号。
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函数定义
sint8 espconn_connect(struct espconn *espconn)
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参数
struct espconn *espconn：对应⽹网络连接的结构体
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返回
0：成功
其它：失败，返回错误码
• ESPCONN_ARG：未找到参数 espconn 对应的 TCP 连接
• ESPCONN_MEM：空间不不⾜足
• ESPCONN_ISCONN：连接已经建⽴立
• ESPCONN_RTE：路路由异常
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3，问题：
请问，返回0[成功]做何解释。我用的TCP连接方式，这个TCP连接应该连接,还是不连接呢~？
4，现象：
wifi连接成功，并获取到了IP。 现在esp8266冲当TCPclient连接TCP SERVER。我的TCP SERVER并没有打开。调用espconn_connect时，为什么也返回0呢！！！？？？
5，代码片段：
//[TCP] tcp connect init
void ICACHE_FLASH_ATTR Tcp_Connect_Init()
{
uint8 server_ip [4] = DATA_SERVER_IP;
os_memset(&ser_tcp_cmd, 0, sizeof(ser_tcp_cmd));
os_memset(&tcp_conn, 0, sizeof(tcp_conn));
os_memcpy(ser_tcp_cmd.remote_ip, server_ip, 4);
ser_tcp_cmd.remote_port = DATA_SERVER_PROT;
ser_tcp_cmd.local_port = espconn_port();
tcp_conn.proto.tcp = &ser_tcp_cmd;
tcp_conn.type = ESPCONN_TCP;
tcp_conn.state = ESPCONN_NONE;
os_printf("[upgrade] tcp_cmd_func enter\n");
// regist connect call back!!!!
if (espconn_regist_connectcb(&tcp_conn, tcp_connect_callback)) {
os_printf("regist con_cb err\n");
return;
}
// connect
uint8 ret = espconn_connect(&tcp_conn);
if (ret != 0) {
os_printf("[upgrade]espconn_create fail, errcode=%d\n", ret);
espconn_disconnect(&tcp_conn);
Esp8266_Send_Connect_Status(CONNECT_SERVER_ERROR);
// os_timer_arm(&tcp_cmd_timer, 5000, 0);
return;
}
os_printf("[upgrade] tcp_cmd_func leave. conn status=%d\n", ret);
}
#define DEBUG 1
// [TCP] call back, connect success
void tcp_connect_callback(void *arg)
{
struct espconn *ptrespconn_tmp = (struct espconn *)arg;
uint8_t mac[6];
char upgrade_request[16];
#if DEBUG
os_printf("[upgrade]tcp_connect_callback enter, net state=%d\n", ptrespconn_tmp->state);
#endif
espconn_set_opt(ptrespconn_tmp, ESPCONN_KEEPALIVE);
espconn_set_keepalive(ptrespconn_tmp, ESPCONN_KEEPINTVL, NULL);
if (ptrespconn_tmp->state == ESPCONN_CONNECT)
{
if (espconn_regist_recvcb(&tcp_conn, esp_tcp_recv_entrance)) {
os_printf("regist recv_cb err\n");
// espconn_mesh_disable(NULL);
return;
}
}
#if DEBUG
else
{
os_printf("[upgrade] no ESPCONN_CONNECT \n");
}
#endif // DEBUG
Esp8266_Send_Connect_Status(CONNECT_OK);
#if DEBUG
os_printf("[upgrade] tcp_connect_callback leave\n");
#endif
}
6，串口日志
没有打开TCPSERVER的日志
\0r\0l溫r運0?鈔?堗?傡p?巶焅0?挓菕茕?p騨n??騨膾茕?b?l`$`黳騨嗝軃鄠抢l€€€b?n忏n滥帓?瀸p岒nn?牧寧\0l`鼝?俷?帉l`涓`rn|拻n?庎馇鉲`箏睦??俷?帉岒nn?娜l`nn嗝躙0鄏?廛€pp捾<泥?b滥緙騨?牧?\0l`鼝?俷€rnr帓?睦??rp騨嗝軃鄏?廛??pp捾<拿庈p岒nn?睦r??俷??nr帓?睦?悓?r咣抧?庎偳躭`鼘廛\0?俷冷?r茇騨鉨倢巐`臏膾苊呢b?r??鈔?芨挏\0r屸茜I8倢?怱DK version:2.2.0(f28eaf2)
mode : sta(60:01:94:02:a4:06)
add if0
ret=1, ssid=them, pwd=qwert123456
scandone
event 2
mode: 0 -> 3
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 2
cnt
connected with them, channel 11
dhcp client start...
event 0
connect to ssid them, channel 11
ip:192.168.0.215,mask:255.255.255.0,gw:192.168.0.1
event 3
ip:192.168.0.215,mask:255.255.255.0,gw:192.168.0.1[upgrade] tcp_cmd_func enter
[upgrade] tcp_cmd_func leave. conn status=0
pm open,type:2 0
打开了TCPSERVER的日志
\0r\0l溫r運0?鈔?堗?傡p?巶運0?掃菕茕?p騨n??騨膾茕?b?塺rp騨嗝躙0鄠抢l€€€b?n忏n滥帓?瀸p岒nn?牧寧\0l`鼝?俷?帉l`涓`rn|拻n?庎馇鉲`箏睦??俷??岒nn?娜l`nn嗝軃鄏?廛€pp捾<泥?b滥>~騨?牧?\0l`鼝?俷?rnr帓?睦??rp騨嗝躙0鄏?廛??pp捾<拿庈p岒nn?睦r??俷??nr帓?睦?悓?r咣抧€鄠擒l`鼘廛\0?俷€?r茇騨鉨倢巐`臏膾苊呢b?r??鈔郼?挏\0r屸茜?倢?怱DK version:2.2.0(f28eaf2)
mode : sta(60:01:94:02:a4:06)
add if0
ret=1, ssid=them, pwd=qwert123456
scandone
event 2
mode: 0 -> 3
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 2
cnt
connected with them, channel 11
dhcp client start...
event 0
connect to ssid them, channel 11
ip:192.168.0.215,mask:255.255.255.0,gw:192.168.0.1
event 3
ip:192.168.0.215,mask:255.255.255.0,gw:192.168.0.1[upgrade] tcp_cmd_func enter
[upgrade] tcp_cmd_func leave. conn status=0
[upgrade]tcp_connect_callback enter, net state=3
<[upgrade] tcp_connect_callback leave
pm open,type:2 0
明白情况的大侠，请说一下，怎么回事。Statistics: Posted by Sam Shen — Wed Mar 14, 2018 6:17 pm
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