From 4dd999178c1d4580eee5fc9493521919cc5bde1f Mon Sep 17 00:00:00 2001
From: pablorevilla-meshtastic <pablorevilla@gmail.com>
Date: Mon, 9 Feb 2026 21:31:34 -0800
Subject: [PATCH] more details

---
 meshview/radio/coverage.py | 12 +++++++++++-
 meshview/web_api/api.py    |  7 +++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/meshview/radio/coverage.py b/meshview/radio/coverage.py
index cc1c8a9..7755d18 100644
--- a/meshview/radio/coverage.py
+++ b/meshview/radio/coverage.py
@@ -1,7 +1,13 @@
 import math
 from functools import lru_cache
 
-from pyitm import itm
+try:
+    from pyitm import itm
+
+    ITM_AVAILABLE = True
+except Exception:
+    itm = None
+    ITM_AVAILABLE = False
 
 DEFAULT_CLIMATE = 5  # Continental temperate
 DEFAULT_GROUND = 0.005  # Average ground conductivity
@@ -48,6 +54,8 @@ def compute_coverage(
     step_km: float,
     reliability: float,
 ) -> list[tuple[float, float, float]]:
+    if not ITM_AVAILABLE:
+        return []
     points = []
     distance = max(step_km, 1.0)
     while distance <= radius_km:
@@ -94,6 +102,8 @@ def compute_perimeter(
     reliability: float,
     threshold_dbm: float,
 ) -> list[tuple[float, float]]:
+    if not ITM_AVAILABLE:
+        return []
     perimeter = []
     distance = max(step_km, 1.0)
     for bearing in range(0, 360, BEARING_STEP_DEG):
diff --git a/meshview/web_api/api.py b/meshview/web_api/api.py
index 34a963a..6bd7b17 100644
--- a/meshview/web_api/api.py
+++ b/meshview/web_api/api.py
@@ -20,6 +20,7 @@ from meshview.radio.coverage import (
     DEFAULT_MIN_DBM,
     DEFAULT_RELIABILITY,
     DEFAULT_THRESHOLD_DBM,
+    ITM_AVAILABLE,
     compute_coverage,
     compute_perimeter,
 )
@@ -1050,6 +1051,12 @@ async def api_coverage(request):
     except (KeyError, ValueError):
         return web.json_response({"error": "Invalid node_id"}, status=400)
 
+    if not ITM_AVAILABLE:
+        return web.json_response(
+            {"error": "Coverage requires pyitm. Run: pip install -r requirements.txt"},
+            status=503,
+        )
+
     def parse_float(name, default):
         value = request.query.get(name)
         if value is None: