Security app for elderly people

We want to create an app for elderly people living alone. In case they have a medical issue, accident, burglars/criminals in house or any other issues, their relatives/person of trust will be informed that they need help. 1. On a regular basis (e.g. 1, 2 or more time-s per day) the user gets a message "all ok?" before a given time (e.g. 1st time before 12 am, 2nd time before 10 pm). He then has 30 minutes to enter a code (e.g. 1234) to confirm that all is ok, or a different code (6543) if he needs help. Note: User can chose how many times in a day and by what time he wish to get the „all ok“ message. Note: Reason why user has to enter a code (and not just confirm with a click): In case he/she (or her-his phone) is in the „hands“ of a burglar/criminal they (the criminals) can‘t simply confirm all is ok but the user must enter a code and can (discretely) use the problem code to say there is a problem (without the burglars/criminals to notice that he did call for help). 2. If the „all ok“ code is not entered by the set time, the app will send an reminder message. "Please enter your code to confirm that all is ok." 3. If the system doesn‘t get a „all ok“ reply (code 1123) within 30 minutes or it gets a „problem“ reply (code 6543) it will send an emergency message to a person of trust. Person of trust can then decide how to deal with the situation, what to do (e.g. try to call the user, visit, call police.) Note: User can chose person(s) of trust by entering his-her name an phone number. 4. Emergency button for user to quickly inform person of trust that he/she needs help anytime (e.g. fallen down the stairs, burglars in house....)