android - Energy economy: BLE device - when to make connectable? -

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i designing custom ble device protocol. device 1 of - scales, blood pressure monitor, fitness band.

the protocol defines collection procedure android/ios app (collector) use collect sensor data 1 of these devices.

we can assume collector present 50% of time , scanning air broadcasted device connect , collect data it

my question is: effective way of making device connectable, battery power in mind?

my current approach:

device connectable, if

  • (a) has unsent measurements user,
  • (b) user turned on (by stepping on scales, pushing button or whatever)

in case (b) device broadcasts e.g. each 1 seconds , available connected collector

in case (a) device broadcasts e.g. each 5 seconds , available connected collector

as conditions (a)/(b) not apply, device goes sleeping mode - not broadcasting anything.

is effective approach means of energy consumption? or there better practices accomplish "device visibility" ?

p.s. not find better resource asking that, question can considered programming question, related firmware programming

see decision tree this.

if link sleep/off , start boxes together, code runs extremely efficient infinite loop turn device on if turn on, or if there data share.

start -----

b) did user turn me on?

  • no: proceed a)
  • yes: proceed questions 1.and 2.

a) have data send?

  • no: if there no 'user on' command and no data needs sent, then: proceed sleep/off state (which presumably leads start box , begins loop on again)

  • yes: device not turned on user, has data send; then:

    1. if connection=true --> send data.
    2. if connection =/= true --> start timer , begin connecting loop next 2-5 mins @ regular intervals of either 1 or 5 seconds.

the connecting loop ends when either timer=2-5min or connection=true. when timer runs out, proceed off/sleep state.

note: may or may not want add error handler make code break a) in case.


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