EC800K-CN通过USB-TTL工具连接电脑，使用串口助手发送AT指令，通过HTTPS连接阿里云时，发送AT+QHTTPGET=80这一串指令后返回OK紧接着又返回“+CME ERROR: 716”。
是什么原因？
调试信息如下：先使用MQTT连接了阿里云获取URL，然后想通过HTTPS访问得到的URL
[2024-10-12 13:27:12.754]
TX：ATE0
[2024-10-12 13:27:13.764]
RX：
OK
[2024-10-12 13:27:15.634]
TX：AT+QMTCFG=“recv/mode”,0,0,1
[2024-10-12 13:27:16.653]
RX：
OK
[2024-10-12 13:27:18.253]
TX：AT+QMTCFG=“aliauth”,0,“a1VFUIpSfYa”,“PWRM”,“9347a62db060fb8cf532d7f6dc845a04”
[2024-10-12 13:27:19.273]
RX：
OK
[2024-10-12 13:27:20.594]
TX：AT+QMTOPEN=0,“iot-as-mqtt.cn-shanghai.aliyuncs.com”,1883
[2024-10-12 13:27:21.783]
RX：
OK
+QMTOPEN: 0,0
[2024-10-12 13:27:23.130]
TX：AT+QMTCONN=0,“abcd”,“abc”,“abc”
[2024-10-12 13:27:24.325]
RX：
OK
+QMTCONN: 0,0,0
[2024-10-12 13:27:25.522]
TX：AT+QMTSUB=0,1,“/ota/device/upgrade/a1VFUIpSfYa/PWRM”,0
[2024-10-12 13:27:26.619]
RX：
OK
+QMTSUB: 0,1,0,1
[2024-10-12 13:27:28.013]
TX：AT+QMTSUB=0,2,“/sys/a1VFUIpSfYa/PWRM/thing/ota/firmware/get_reply”,0
[2024-10-12 13:27:29.115]
RX：
OK
+QMTSUB: 0,2,0,1
[2024-10-12 13:27:31.050]
TX：AT&W
[2024-10-12 13:27:32.251]
RX：
OK
[2024-10-12 13:27:34.315]
TX：AT+QMTPUBEX=0,0,0,0,“/ota/device/inform/a1VFUIpSfYa/PWRM”,58
[2024-10-12 13:27:35.330]
RX：
[2024-10-12 13:27:37.690]
TX：{“id”:“1”,“params”:{“version”:“1.2”,“module”:“default”}}
[2024-10-12 13:27:38.810]
RX：
OK
+QMTPUBEX: 0,0,0
[2024-10-12 13:27:40.212]
TX：AT+QMTPUBEX=0,0,0,0,“/sys/a1VFUIpSfYa/PWRM/thing/ota/firmware/get”,90
[2024-10-12 13:27:41.221]
RX：
[2024-10-12 13:27:42.444]
TX：{“id”:“2”,“version”:“1.0”,“params”:{“module”:“default”},“method”:“thing.ota.firmware.get”}
[2024-10-12 13:27:43.644]
RX：
OK
+QMTPUBEX: 0,0,0
+QMTRECV: 0,0,“/sys/a1VFUIpSfYa/PWRM/thing/ota/firmware/get_reply”,371,"{“code”:200,“data”:{“size”:66640,“sign”:“e86130b5d14dae0488939f45300e37c7”,“version”:“1.3”,“signMethod”:“Md5”,“url”:"https://ota-cn-shanghai.iot-thing.aliyuncs.com/ota/08c90c9bd1b1da94824db78e16319188/cm249ryp500053j9q8z4yj13k.bin?auth_key=1728795464-6de71b6c76b64a58bbcfdae2b8c6e3af-0-ac62e13584dd59c892f50213e50cbcb6",“md5”:“e86130b5d14dae0488939f45300e37c7”},“id”:“2”}"
[2024-10-12 13:27:46.073]
TX：AT+QHTTPCFG=“contextid”,1
[2024-10-12 13:27:47.084]
RX：
OK
[2024-10-12 13:27:48.330]
TX：AT+QHTTPCFG=“responseheader”,1
[2024-10-12 13:27:49.341]
RX：
OK
[2024-10-12 13:27:50.201]
TX：AT+QICSGP=1,1,“CTNET”,“”,“”,1
[2024-10-12 13:27:51.223]
RX：
OK
[2024-10-12 13:27:53.954]
TX：AT+QHTTPCFG=“sslctxid”,1
[2024-10-12 13:27:54.967]
RX：
OK
[2024-10-12 13:27:56.618]
TX：AT+QSSLCFG=“sslversion”,1,1
[2024-10-12 13:27:57.635]
RX：
OK
[2024-10-12 13:27:58.601]
TX：AT+QSSLCFG=“ciphersuite”,1,0x0005
[2024-10-12 13:27:59.619]
RX：
OK
[2024-10-12 13:28:00.649]
TX：AT+QSSLCFG=“seclevel”,1,0
[2024-10-12 13:28:01.672]
RX：
OK
[2024-10-12 13:28:02.890]
TX：AT+QHTTPURL=201,80
[2024-10-12 13:28:03.920]
RX：
CONNECT
[2024-10-12 13:28:05.464]
TX：https://ota-cn-shanghai.iot-thing.aliyuncs.com/ota/08c90c9bd1b1da94824db78e16319188/cm249ryp500053j9q8z4yj13k.bin?auth_key=1728785559-9acca4c0d881486fb0e923eb076206d6-0-453a49a49ad870660f4ad5635165c9b5
[2024-10-12 13:28:06.473]
RX：
OK
[2024-10-12 13:28:09.674]
TX：AT+QHTTPGET=80
[2024-10-12 13:28:10.933]
RX：
OK
+CME ERROR: 716