Treatments & IOB¶

Strimma can fetch treatment data (bolus, carbs, basal) from Nightscout and compute your insulin on board (IOB).

What Are Treatments?¶

In diabetes management, "treatments" are actions you take that affect glucose:

• Bolus — a dose of rapid-acting insulin (e.g., 3.5 units of Fiasp before a meal)
• Carbs — carbohydrates consumed (e.g., 45g from a meal)
• Basal — background insulin rate (e.g., 0.8 U/h)

Strimma fetches this data from your Nightscout server. The data typically comes from your insulin pump or closed-loop system (e.g., CamAPS FX via mylife Cloud → Nightscout).

Enable Treatment Sync¶

1. Go to Settings > Treatments
2. Toggle Fetch bolus, carb, and basal data on
3. Make sure you have a working Nightscout connection (either push or follower)

Strimma polls for treatments every 5 minutes (24-hour window per poll). The first sync — and any sync after a long offline period — backfills up to 100 days from Nightscout.

What You See¶

On the Graph¶

Treatment markers appear on the glucose graph:

• Bolus — blue downward triangles at the bottom of the graph, labeled with units (e.g., "2.5U"). Larger triangles = larger doses.
• Carbs — green upward triangles at the top of the graph, labeled with grams (e.g., "45g"). Larger triangles = more carbs.

In the BG Header¶

When you have active insulin, an IOB pill appears showing your current insulin on board (e.g., "IOB 2.3U").

Tap the IOB pill to open a detail dialog listing:

• Each recent bolus — time, original dose, and remaining IOB
• Total IOB at the bottom
• Your configured insulin type and DIA

IOB Calculation¶

IOB (Insulin on Board) represents how much rapid-acting insulin is still active in your body. Strimma models insulin activity as an exponential decay curve — insulin is most active right after injection and gradually fades over several hours.

The speed of this decay depends on your insulin type. Faster insulins (Fiasp, Lyumjev) decay quicker than standard rapid-acting insulins (NovoRapid, Humalog).

Strimma sums the remaining activity from all recent boluses to give you a single IOB number.

For the full mathematical model, see IOB Calculation.

Insulin Types¶

Choose your insulin type in Settings > Treatments:

Custom DIA¶

If you select Custom, you can set the Duration of Insulin Action (DIA) in hours (2–10). The tau is computed as:

τ = DIA (hours) × 60 / 5 = DIA × 12 minutes

For example, a 5-hour DIA gives τ = 60 minutes.

Data Source¶

Treatments come from your Nightscout server's /api/v1/treatments.json endpoint. Strimma doesn't create or modify treatments — it only reads them.

Common treatment sources:

• CamAPS FX → mylife Cloud → Nightscout
• AndroidAPS → Nightscout (direct upload)
• Loop → Nightscout (direct upload)
• Manual entries in Nightscout (Careportal)

Data Retention¶

• On the first sync (or after a long offline period), Strimma backfills up to 100 days of treatments from Nightscout. Beyond that initial window, treatments accumulate as Strimma keeps polling.
• Once synced, treatments are kept according to Settings > General > Storage > Data retention (default: Forever; minimum: 3 months). The same setting governs glucose readings and exercise sessions.
• You can manually pull older history in Settings > Treatments > Pull treatments (30 / 90 / 365 days). Picking a long retention window doesn't backfill older data — it just means anything Strimma already has stays.
• Nightscout remains the long-term store, so a fresh install can always re-fetch history from there.