diff --git a/modules/umdk-m200.c b/modules/umdk-m200.c
index 42582dc..3977c0e 100644
--- a/modules/umdk-m200.c
+++ b/modules/umdk-m200.c
@@ -387,7 +387,7 @@ void umdk_m200_command(char *param, char *out, int bufsize) {
 	}
 	else if (strstr(param, "iface ") == param) { 
 		param += strlen("iface ");    // Skip command	
-		uint8_t interface;
+		uint8_t interface = 0;
 		if (strstr(param, "can") == param) { 	
 			interface = 2;
 		}
diff --git a/modules/umdk-m230.c b/modules/umdk-m230.c
index 7e7e1a7..cacde9c 100644
--- a/modules/umdk-m230.c
+++ b/modules/umdk-m230.c
@@ -389,7 +389,7 @@ void umdk_m230_command(char *param, char *out, int bufsize) {
 	}		
 	else if (strstr(param, "set mode_tariff ") == param) {
 		param += strlen("set mode_tariff ");    // Skip command
-		uint8_t mode;
+		uint8_t mode = 0;
 		if (strstr(param, "one") == param) { 
 			param += strlen("one");    // Skip command
 			mode = 1;
diff --git a/modules/umdk-pwm.c b/modules/umdk-pwm.c
index daffb2b..02b424c 100644
--- a/modules/umdk-pwm.c
+++ b/modules/umdk-pwm.c
@@ -53,7 +53,7 @@ void umdk_pwm_command(char *param, char *out, int bufsize) {
 				dev--;
 				param += strlen(" ");    						// Skip space				
 				
-				uint8_t mask;
+				uint8_t mask = 0;
 				if(strstr(param, "on ") == param) {
 					param += strlen("on ");				// Skip command
 					mask = 1;
diff --git a/mqtt.c b/mqtt.c
index 0fdd548..e5d995b 100644
--- a/mqtt.c
+++ b/mqtt.c
@@ -1337,7 +1337,11 @@ int main(int argc, char *argv[])
             exit(EXIT_FAILURE);
         }
         snprintf(pidval, sizeof(pidval), "%d\n", getpid());
-        write(pidfile, pidval, strlen(pidval));
+
+        if (write(pidfile, pidval, strlen(pidval)) < 0)
+        {
+            exit(EXIT_FAILURE);
+        }
         
         sleep(30);
     }
@@ -1491,9 +1495,19 @@ int main(int argc, char *argv[])
 	mosquitto_message_callback_set(mosq, my_message_callback);
 	mosquitto_subscribe_callback_set(mosq, my_subscribe_callback);
 
-	if(mosquitto_connect(mosq, host, port, keepalive)){
-		snprintf(logbuf, sizeof(logbuf), "Unable to connect.\n");
-		logprint(logbuf);
+	if (mosquitto_connect(mosq, host, port, keepalive) == MOSQ_ERR_ERRNO) {
+        snprintf(logbuf, sizeof(logbuf), "Unable to connect");
+        int errno_saved = errno;
+        char *errmsg_extracting = strerror_r(errno_saved, errbuf, sizeof(errbuf));
+        if (errmsg_extracting != errbuf) {
+            logprint(strcat(logbuf, ".\n"));
+        } else {
+            strncat(logbuf, ": ", sizeof(logbuf) - (strlen(logbuf) + 1));
+            strncat(logbuf, errbuf, sizeof(logbuf) - (strlen(logbuf) + 1));
+            strncat(logbuf, "\n", sizeof(logbuf) - (strlen(logbuf) + 1));
+            logprint(logbuf);
+        }
+
 		return 1;
 	}
 
diff --git a/unwds-mqtt.c b/unwds-mqtt.c
index f688601..cd04145 100644
--- a/unwds-mqtt.c
+++ b/unwds-mqtt.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2017 Unwired Devices LLC [info@unwds.com]
+    /* Copyright (c) 2017 Unwired Devices LLC [info@unwds.com]
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -260,4 +260,36 @@ int unwds_modid_by_name(char *name) {
     }
     
     return -1;
+}
+
+/* GPS binary format decoder */
+/* format is used by umdk-gps, umdk-idcard and other GPS-enabled devices */
+void parse_gps_data(gps_data_t *gps, uint8_t *data, bool decode_nmea) {
+    memset(gps, 0, sizeof(gps_data_t));
+ 
+    gps->ready = (data[0] & 1);
+ 
+    if (gps->ready) {
+        int lat, lat_d, lon, lon_d;
+        lat = data[1] + (data[2] << 8);
+        lat_d = data[3];
+        lon = data[4] + (data[5] << 8);
+        lon_d = data[6];
+ 
+        gps->latitude = (float)lat + (float)lat_d/100.0;
+        gps->longitude = (float)lon + (float)lon_d/100.0;
+ 
+        /* Apply sign bits from reply */
+        if ((data[0] >> 5) & 1) {
+            gps->latitude = -gps->latitude;
+        }
+ 
+        if ((data[0] >> 6) & 1) {
+            gps->longitude = -gps->longitude;
+        }
+ 
+        gps->valid = (data[0] >> 7) & 1;
+    }
+ 
+    return;
 }
\ No newline at end of file