From 1d3bf157bf477e2244fb85ddb34ef581d0242bfb Mon Sep 17 00:00:00 2001
From: barbudor <barbudor@barbudor.net>
Date: Thu, 21 Jul 2022 22:07:22 +0200
Subject: [PATCH] fix removal of negative values

---
 tasmota/tasmota_xsns_sensor/xsns_75_prometheus.ino | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tasmota/tasmota_xsns_sensor/xsns_75_prometheus.ino b/tasmota/tasmota_xsns_sensor/xsns_75_prometheus.ino
index c391afe16..f08c730b0 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_75_prometheus.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_75_prometheus.ino
@@ -298,7 +298,7 @@ void HandleMetrics(void) {
             JsonParserObject Object3 = value2.getObject();
             for (auto key3 : Object3) {
               const char *value = key3.getValue().getStr(nullptr);
-              if (value != nullptr && isdigit(value[0])) {
+              if (value != nullptr && (isdigit(value[0]) || (value[0] == '-') || (value[0] == '.'))) {
                 String sensor = FormatMetricName(key2.getStr());
                 String type = FormatMetricName(key3.getStr());
 
@@ -311,7 +311,7 @@ void HandleMetrics(void) {
             }
           } else {
             const char *value = value2.getStr(nullptr);
-            if (value != nullptr && isdigit(value[0])) {
+            if (value != nullptr && (isdigit(value[0]) || (value[0] == '-') || (value[0] == '.'))) {
               String sensor = FormatMetricName(key1.getStr());
               String type = FormatMetricName(key2.getStr());
               if (strcmp(type.c_str(), "totalstarttime") != 0) {  // this metric causes Prometheus of fail
@@ -336,7 +336,7 @@ void HandleMetrics(void) {
         const char *value = value1.getStr(nullptr);
         String sensor = FormatMetricName(key1.getStr());
 
-        if (value != nullptr && isdigit(value[0] && strcmp(sensor.c_str(), "time") != 0)) {  //remove false 'time' metric
+        if (value != nullptr && (isdigit(value[0]) || (value[0] == '-') || (value[0] == '.')) && strcmp(sensor.c_str(), "time") != 0) {  //remove false 'time' metric
           WritePromMetricStr(PSTR("sensors"), kPromMetricGauge, value,
             PSTR("sensor"), sensor.c_str(),
             nullptr);