App for SOS machine repair OS Ticket

About my client: Construction and machine rentals Objective: Provide a tool: mobile android app (iOS would be nice but not mandatory) and web to manage maintenance machine APP/WEB Control client mechanical SOS tickets in web/app with integration with ONE IM/AIM (Whatsapp, telegram, wechat .. other) - receive and manage tickets - basic input forms and instant photos (not upload) Actors: - Manager Local of work: office (desktop) or external (mobile app) Will receive calls or emails requesting assistance for machine repair/maintenance Will input system with new tickets Will manage technician on tasks and keep up what was done on machines Will make reports to area manager - Technician Local of work: External: on the field (mobile app) Will take or receive assignments Will repair or give maintenance to machines Will do reports of their actions on the field WEB: Role: - manager: (1) create new tickets (1.1) When (time) (1.2) What Machine (Machine ID) (1.3) Where (Location) (1.4) Problem description (Ex. flat tyre, out of fuel, oil leak, electrical, etc etc) (1.5) additional information (if need) (2) assign ticket to someone (3) reports (day/week/month): machine reports history, technician reports history (4) close tickets (if technician doesn't do it) - Real time status page (1) Tickets Status (periodic) (1.1) All not assigned tickets/task (1.2) All assigned tickets (time, machine id, technician) (1.3) All started assignment (time, machine id, technician (2) New ticket / not assigned ticket (When, Machine, Where, Problem) (Update status) (3) Assigned ticket (When, Machine, Where, Problem) (Update status) (4) Started assignment (When, Machine, Where, Problem) (Update status) (5) Closed ticket (When, Machine, short machine repair/maintenance report, photos) (Update status) APP Role: - manager: (1) create new tickets (1.1) When (time) (1.2) What Machine (Machine ID) (1.3) Where (Location) (1.4) Problem description (Ex. flat tyre, out of fuel, oil leak, electrical, etc etc) (1.5) additional information (if need) (2) assign ticket to someone (3) reports (day/week/month): machine reports history, technician reports history (4) close tickets (if technician doesn't do it) - technician: (1) take or receive assignment, find machine and move to spot (time) (2) start assignment (time) (2.1) get machine ID, horimetre (hours) or KM (2.2) before: machine checklist form, identify main problems and set tasks, tasks instant machine photos (not upload) (2.3) machine repair/maintenance form (replaced parts, new ones, oil and other services (2.4) after: update machine checklist form, final check and task instant machine photos (not upload) (2.5) close ticket Instant Messenger (IM) posting on group (or telegram bot or similar) Post types (1) Ticket Status (periodic) (1.1) all not assigned tickets/task (1.2) all assigned tickets (time, machine id, technician) (1.3) all started assignment (time, machine id, technician) (2) New ticket / not assigned ticket (When, Machine, Where, Problem) (One Time and update status) (3) Assigned ticket (When, Machine, Where, Problem) (One Time and update status) (4) Started assignment (When, Machine, Where, Problem) (One Time and update status) (5) Closed ticket (When, Machine, short machine repair/maintenance report, photos) (One Time and update status) Important APP must work offline internet connection One technician can only have one opened assignment at time