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UART/Serial Port Emulation over BLE exple from sdk1.7

nrf52840

pca10056

UART/Serial Port Emulation over BLE exple from sdk1.7

https://inf

ocenter.nordicsemi.com/index.jsp?topic=%2Fstruct_sdk%2Fstruct%2Fsdk_nrf5_latest.html&cp=7_1

in the description section9 it shows that

For sending data from the device to nRF Connect, enter any text, for example, "Hello", on the COM listener. Observe that a notification with the corresponding ASCII values is sent to the peer on handle 0x12. For the string "Hello", the notification is '48 65 6C 6C 6F'

I do have the problem on

For sending data from the device to nRF Connect, enter any text, for example, "Hello", on the COM listener. Observe that a notification with the corresponding ASCII values is sent to the peer on handle 0x12. 

i do see some similiar question here

https://devzone.nordicsemi.com/f/nordic-q-a/37327/ble_app_uart-with-nrf-connect-on-iphone

the answer is

"You need to click the 3 arrows pointing down in the upper right corner of the Nordic UART TX characteristic to enable notifications to said characteristic."

i do click the 3 arrows  but some how i did not find out the 0x12 in the content which decripted

Im wondering if there is  any misunderstanding there

1.I im pretty sure my putty is connect to the device which can receive data

2. I use iphone to be the central

3.I enter "Hello: on the Uart(Putty) but it shows 0x45 65 6c 6c 6f 0d on tx characteristic but not 0x12

4.before the section 9 in the sdk evertthing works fine

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