Retail and restaurant operators in areas with unreliable connectivity lose real money every time the link drops: cashiers stop, queues back up, and staff resort to paper or "come back later." Odoo's Point of Sale already keeps a session partly usable offline — the browser client caches the loaded product catalog and can ring up orders while the connection is down — but its guarantees end at the edges. Payment terminals that need a live call, receipt printing tied to backend report rendering, tax or price rules that depend on a server round-trip, and multi-register stock all become fragile once the outage is more than momentary. When the connection returns, orders push back in a burst with no conflict handling, and a browser refresh or a closed tab during a long outage can silently strand unsynced tickets. Native Odoo runs out of road exactly where these stores need it most: sustained, real-world outages across several terminals.

POS Offline Mode Pro is a build-to-order module ECOSIRE designs, builds, installs, and supports on top of your existing Odoo POS. Technically, it hardens the offline path on both sides of the wire. On the client, it extends the OWL/JS POS frontend to persist every in-flight order to durable local storage (IndexedDB) rather than volatile memory, so a refresh, crash, or shift change never loses a ticket, and it surfaces a live connection-status indicator so cashiers always know whether they are online, degraded, or queuing locally. Offline receipts print from a locally cached QWeb template, and offline payment lines (cash and terminal-logged) are recorded with the metadata needed to reconcile later. On reconnect, a queued-sync engine replays orders in deterministic order against the backend pos.order models, and a reconciliation layer we build into new models.Model classes handles the hard cases — duplicate submission (idempotency keys on each queued order), sequence collisions, and stock movements that other registers changed while you were offline — instead of letting them fail silently.

Under the hood we ship real Odoo server-side code, not just a browser hack. The module declares its dependencies and assets bundles in __manifest__.py, adds new models with fields, compute methods and @api.depends where sync state and reconciliation status need to be tracked and reported, and locks every new model and menu down with ir.model.access.csv plus record rules so offline queue data respects the same POS-manager permissions as the rest of the system. Sync status and exception queues get their own backend list/form views (XML) and, where useful, an OWL widget in the POS UI; reconciliation exceptions can trigger automated actions (base.automation) to alert a manager. The re-sync transport uses Odoo's standard JSON-RPC/XML-RPC calls the POS client already speaks, so nothing bypasses your access rules or audit trail. We build against your edition — the offline-payment behavior differs between Community and the Enterprise IoT/terminal integrations, and we scope that explicitly during discovery — and target Odoo 17.0, 18.0, or 19.0 to match your deployment.

Because this is build-to-order, you are not downloading a pre-canned app and hoping it fits. After a short scoping call we confirm your Odoo version and edition, register topology, payment methods, and what "acceptable" offline behavior means for your business (e.g. offline card handling, receipt legal requirements, stock policy). We build the module to that scope, validate it on a staging copy of your database through UAT, and deploy with a documented rollback. Typical delivery is one working week from confirmed scope, and you receive the full installable source and git repository so the work is yours to keep. ECOSIRE then supports it through a post-go-live window and remains available for version upgrades as you move across Odoo releases.