STM32F4. Read data from UART. ERROR: Out of Memory!

Error:

0) send
1) send
2) send
3) send
4) send
5) send
6) send
7) send
8) send
9) send
10) send
11) send
12) send
13) send
...
...
...
126) send
127) send
128) send
129) send
130) send
131) send
132) send
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Error processing Serial data handler - removing it.
Execution Interrupted during event processing.
at line 3 col 18
  process.memory();
in function called from system
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
...
...
...
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
ERROR: Out of Memory!
ERROR: Out of Memory!
...
...
...
ERROR: Out of Memory!
ERROR: Out of Memory!
Execution Interrupted during event processing.
at line 2 col 18
      if (arr == null)  return;
                  
in function called from system
{
    "crosstime": {
        "1": [
            1,
            10,
            3,
            3
        ],
        "2": [
            1,
            10,
            3,
            3
        ],
        "3": [
            1,
            20,
            3,
            1
        ]
    },
    "racks": {
        "1": {
            "1": 1,
            "2": 1,
            "3": 0,
            "4": 0,
            "5": 5,
            "6": 5
        },
        "2": {
            "1": 2,
            "2": 2,
            "3": 0,
            "4": 0,
            "5"
>