Reapply "Save onroad/offroad uptime to param (#35769)" (#35796)

This reverts commit 87270952c4.

common/params_keys.h

@@ -123,5 +123,7 @@ inline static std::unordered_map<std::string, ParamKeyAttributes> keys = {
     {"UpdaterState", {CLEAR_ON_MANAGER_START, STRING}},
     {"UpdaterTargetBranch", {CLEAR_ON_MANAGER_START, STRING}},
     {"UpdaterLastFetchTime", {PERSISTENT, TIME}},
+    {"UptimeOffroad", {PERSISTENT, FLOAT, "0.0"}},
+    {"UptimeOnroad", {PERSISTENT, FLOAT, "0.0"}},
     {"Version", {PERSISTENT, STRING}},
 };

system/hardware/hardwared.py

@@ -201,6 +201,10 @@ def hardware_thread(end_event, hw_queue) -> None:
   params = Params()
   power_monitor = PowerMonitoring()
 
+  uptime_offroad: float = params.get("UptimeOffroad", return_default=True)
+  uptime_onroad: float = params.get("UptimeOnroad", return_default=True)
+  last_uptime_ts: float = time.monotonic()
+
   HARDWARE.initialize_hardware()
   thermal_config = HARDWARE.get_thermal_config()
 
@@ -445,6 +449,17 @@ def hardware_thread(end_event, hw_queue) -> None:
 
     params.put_bool_nonblocking("NetworkMetered", msg.deviceState.networkMetered)
 
+    now_ts = time.monotonic()
+    if off_ts:
+      uptime_offroad += now_ts - max(last_uptime_ts, off_ts)
+    elif started_ts:
+      uptime_onroad += now_ts - max(last_uptime_ts, started_ts)
+    last_uptime_ts = now_ts
+
+    if (count % int(60. / DT_HW)) == 0:
+      params.put("UptimeOffroad", uptime_offroad)
+      params.put("UptimeOnroad", uptime_onroad)
+
     count += 1
     should_start_prev = should_start