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8.1 Wireless functions description
The wheelchair can be controlled by mobile phone via Bluetooth 5.1(IEEE 802.15.4
Bluetooth).
Protocol: Bluetooth 4.0
Frequency band: 2.4 GHz ISM frequency band
Frequency: 2.400 GHz ~ 2.4835 GHz GHz
Modulation technology: GFSK
Spread spectrum technology: Frequency-Hopping
Output power: +4 dBm~-20 dBm（in 4 dB steps）
Sensitivity: -93 dBm(BLE mode)
Distance:<10 m
If mobile phone cannot control the wheelchair correctly, please stop use mobile
phone and use the button on wheelchair immediately.
Please remove other wireless devices from the environment, and connect mobile
phone to wheelchair again, try controlling wheelchair with mobile phone. Do not
use mobile phone until mobile phone can control the handpiece correctly.
8.4 Information addressing wireless issues
8.2 Operating characteristics of Bluetooth wireless technology
At the application layer, AES128 is used to re-encrypt the interactive data by
hardware. The 128-bit initial password will be calculated by the feature code of the
interactive parties according to the algorithm, and will be continuously updated and
synchronized during the connection process. Since there are dynamic random
change codes and sequence codes in the data, the actual data sequence of each
communication is changing, and the real data will be seen after decryption. If the
data is incorrect or the content verification is illegal several times, the connection
will be interrupted and the blacklist will be added at the same time, until the
coverage can be removed. Ensure that the signal is transmitted as expected.
8.3 Wireless security measures
8. Wireless technology and related settings
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