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  • Before the hand E.getErrorFlags() returned LOW_MEMORY once.
    The max frequency it still works is about 5 to 10 times per second.
    Also the open connection might be one cause, but how to force them to close?

    wifi.at.debug() provided this lead:

    ["AT+CIPSERVER==1,80\r\n"
    >Uncaught Error: CIPSERVER failed (Timeout)
     at line 1 col 53
    throw Error("CIPSERVER failed ("+(a?a:"Timeout")+")");
                                                        ^
    in function called from system
    
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