ios群聊无法发送消息，用git仓库作为插件引用，都是一样。

[helloWorldGeorge]

测试的日志：
2020-08-21 18:39:11.955783+0800 Runner[2516:1185933] flutter: 发送普通群消息: 899we
2020-08-21 18:39:11.956241+0800 Runner[2516:1183983] topicId==30094929200414721
2020-08-21 18:39:11.956647+0800 Runner[2516:1183983] [MIMC-INFO] sendPacket, SECMSG, header=<ClientHeader 0x600001b35e00>: {
chid: 9
uuid: 27332097396178945
server: "xiaomi.com"
resource: "iOS-IpruDdVs"
cmd: "SECMSG"
id: "ldrPMNSFzcIkHuM-2"
dir_flag: CS_REQ
cipher: 1
}, packet=<MIMCV6Packet: 0x600002ae3260>
2020-08-21 18:39:11.957045+0800 Runner[2516:1183983] [MIMC-INFO] sendUCPacket, SEND_PACKET, PACKET=<MIMCPacket 0x600000448d80>: {
packetId: "ldrPMNSFzcIkHuM-2"
package: "meishuo.meijiehezi.com"
type: UC_PACKET
payload: "\n%\010\277\202\315\200\200\200\200\200(\022\00210\030\201\200\220\242\335\314\3060"\014iOS-IpruDdVs\020\010\032\265\002\n\023\010\277\202\315\200\200\200\200\200(\020\201\200\240\344\333\345\2725\022\330\001eyJmcm9tX2FjY291bnQiOiIxMCIsInRvX2FjY291bnQiOiIzMDA5NDkyOTIwMDQxNDcyMSIsImJpel90eXBlIjoidGV4dCIsInZlcnNpb24iOiIwIiwidGltZXN0YW1wIjoxNTk4MDA2MzUxOTU1LCJyZWFkIjowLCJ0cmFuc2Zlcl9hY2NvdW50IjowLCJwYXlsb2FkIjoiODk5d2UifQ== \001*%\010\277\202\315\200\200\200\200\200(\022\00210\030\201\200\220\242\335\314\3060"\014iOS-IpruDdVs:\021ldrPMNSFzcIkHuM-2B\007bizType"\021ldrPMNSFzcIkHuM-2"
}, mimcPacket type=8
2020-08-21 18:39:11.960183+0800 Runner[2516:1185933] flutter: gid====ldrPMNSFzcIkHuM-2
2020-08-21 18:39:11.960348+0800 Runner[2516:1185933] flutter: {"sequence":null,"toAccount":null,"bizType":"bizType","fromAccount":null,"topicId":30094929200414721,"timestamp":null,"isStore":true,"payload":"eyJmcm9tX2FjY291bnQiOiIxMCIsInRvX2FjY291bnQiOiIzMDA5NDkyOTIwMDQxNDcyMSIsImJpel90eXBlIjoidGV4dCIsInZlcnNpb24iOiIwIiwidGltZXN0YW1wIjoxNTk4MDA2MzUxOTU1LCJyZWFkIjowLCJ0cmFuc2Zlcl9hY2NvdW50IjowLCJwYXlsb2FkIjoiODk5d2UifQ=="}
2020-08-21 18:39:11.971688+0800 Runner[2516:1187044] [MIMC-DEBUG] Send v6-packet msgType:C2S_DOUBLE_DIRECTION
2020-08-21 18:39:11.971825+0800 Runner[2516:1187044] [MIMC-INFO] writeThreadFunc, trySetNextResetTs and setLastPingTimestamp, for sending date type: MIMC_C2S_DOUBLE_DIRECTION
2020-08-21 18:39:11.972119+0800 Runner[2516:1187044] [MIMC-INFO] writeThreadFunc, packetLengthAfterEncode=508
2020-08-21 18:39:11.972264+0800 Runner[2516:1187044] [MIMC-INFO] writeThreadFunc, SECMSG, sendEncodePacketSuccess, packetLen=508
2020-08-21 18:39:12.664091+0800 Runner[2516:1187043] [MIMC-INFO] receiveThreadFunc, V6HeadLengthSuccess, len=8
2020-08-21 18:39:12.664249+0800 Runner[2516:1187043] [MIMC-INFO] receiveThreadFunc, readPacketLengthSuccess! 251==251
2020-08-21 18:39:12.664593+0800 Runner[2516:1187043] [MIMC-INFO] DecodeV6, Actual, v6Header = <ClientHeader 0x600001b24be0>: {
chid: 9
uuid: 27332097396178945
server: "xiaomi.com"
resource: "iOS-IpruDdVs"
cmd: "SECMSG"
subcmd: ""
id: "ldrPMNSFzcIkHuM-2"
dir_flag: SC_ONEWAY
cipher: 1
}, v6Payload =
^QldrPMNSFzcIkHuM-2^R^Vmeishuo.meijiehezi.com^Xŧ˛œáπ±^\ ^D*j
^QldrPMNSFzcIkHuM-2^PÅÄꢛÃ∆0^ZiOS-IpruDdVs ŧ˛œáπ±^(†∂ÁÑ¡.2^Vmeishuo.meijiehezi.com:^Stopic id not exist!@ ^A0†∂ÁÑ¡.ßb ^R
2020-08-21 18:39:12.664859+0800 Runner[2516:1187043] [MIMC-INFO] receiveThreadFunc, v6packet header=<ClientHeader 0x600001b24be0>: {
chid: 9
uuid: 27332097396178945
server: "xiaomi.com"
resource: "iOS-IpruDdVs"
cmd: "SECMSG"
subcmd: ""
id: "ldrPMNSFzcIkHuM-2"
dir_flag: SC_ONEWAY
cipher: 1
}, rawDataLen=169
2020-08-21 18:39:12.664995+0800 Runner[2516:1187043] [MIMC-INFO] handleSecMsg, RECV_PACKET, chid=9, receiverUuid=27332097396178945, packetId=ldrPMNSFzcIkHuM-2, type=4, resource=iOS-IpruDdVs, account=10
2020-08-21 18:39:12.669668+0800 Runner[2516:1185933] flutter: 发送消息回调=={packetId: ldrPMNSFzcIkHuM-2, timestamp: 1598006352672, desc: topic id not exist!, sequence: 15980063526720001, code: 202}