ble_nus_c_string_send maximum message length

[Philip]

Hi. I send 240 byte long messages using ble_nus_c_string_send at the moment. 

How come the length field is a uint16_t if the max size is 247 bytes? Is it for future proofing or is it possible to send more than 256 using the NUS service, and does it automatically split up and rebuild the message string?

Thanks

uint32_t ble_nus_c_string_send	(	ble_nus_c_t *	p_ble_nus_c,
		uint8_t *	p_string,
		uint16_t	length
	)

[haakonsh]

ble_nus_c_string_send does not do any operations on the string and the maximum MTU size is 240 bytes. If you want to send longer strings then you need to split and merge your strings yourself.

Our future devices might be able to handle larger MTU sizes, so I guess that's why the SDK team used a uint16_t for the length field.