data in handleData() has trash on it and can crash the esp8266 when start with "S"

[stdevPavelmc]

NodemMCU 1.0 Platformio latest version Server example sketch

The data argument has trash on it and some times crash the whole sketch on data reception, example snipet:

static void handleData(void *arg, AsyncClient *client, void *data, size_t len)
{
    Serial.write((uint8_t *)data, strlen(data));
    Serial.println(len);

    // reply to client
   // ...
}

Serial output is as this: (sent data is just "S\n")

 new client has been connected to server, ip: 10.42.1.2S
␅�␄␂��␁�␂A␁2

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

Exception (9):
epc1=0x40105ef0 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000003 depc=0x00000000

>>>stack>>>

ctx: sys
sp: 3fffeb70 end: 3fffffb0 offset: 0190
3fffed00:  3ffe8f6a 3fffed4f 3ffef408 00000002  
3fffed10:  40106121 00f3a536 3ffef5b4 00000000  
3fffed20:  3ffeed80 3ffef5b4 3ffef408 4020b4a4  
3fffed30:  00000000 00eee082 4020e524 000003e8 
[...]

The "garbage" is random and some times there is no garbage, I have used memcpy and len to cut the data but some times with some characters (specially the S one) it's prone to crash.

Data is sent like this (Linux)

# echo "S" | nc ip port -w 1

[stdevPavelmc]

Forget it, I managed to get the data cleaned, and triaged the crash on mi side of the code.