Specifications

HM-BT4502 V1.0
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set the INT high.
4. When the external MCU sends the data to the module through the serial
port, it needs to pull the WAKEUP pin from the high level to the low level to
generate a falling edge to wake up the module (because it takes 1ms to
wake up the module to be ready, so the minimum delay between the falling
edge of WAKEUP pin and the serial port data reception is 1ms). After
sending the data, the WAKEUP pin will be pulled from the low level to the
high level, and the module will enter the Sleep mode again.
5. After successful module connection, the "TTM: CONNECT\r\n\0" string is
sent from TX, which can be used to determine whether normal forwarding
operation can be performed. Of course, users can also send a specific
confirmation string to the module through the mobile phone; the host can
confirm the connection after receiving it. If the connection is actively
disconnected by the APP, the “TTM:DISCONNECT\r\n\0 ” string will be
sent from TX. If the connection is abnormally disconnected, the
“TTM:DISCONNECT FOR TIMEOUT\r\n\0”string will be sent from TX.
6. The size of serial data package can be variable, and the length can be any
value within 240 bytes, which can also satisfy the above conditions.
However, in order to make the most efficient use of communication
payload and avoid full-load operation of communication, it is
recommended to use 100, 200, 240 bytes of serial data packages with