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7b2b31bb0d
Read By Type Response Length is one octet (max 255). When MTU was
large enough to return a long characteristic value in one pair, the
server wrote (UINT8)(value_len + 2) and overflowed (e.g. 513 -> 1),
so the client rejected the PDU as GATT_INVALID_PDU (0x04).
Cap server value to 253 bytes per pair, clamp the length byte, and
continue long reads via Read Blob when the capped size is returned.
(cherry picked from commit 97905afccc)
Co-authored-by: zhanghaipeng <zhanghaipeng@espressif.com>