diff --git a/src/netdaemon/Readme.md b/src/netdaemon/Readme.md
index 78288eb..bff20f8 100644
--- a/src/netdaemon/Readme.md
+++ b/src/netdaemon/Readme.md
@@ -4,6 +4,7 @@ BTA mirror temperature network daemon
 Gather information from temperature sensors and send it over ethernet by network request like
 hostname:4444/Tx
 where x is 0 for upper sensors, 1 for lower and 2 for T measured by main controller.
+hostname:4444/Tmean returns mean temperature
 
 Answer format: "X Y T t", where
 
diff --git a/src/netdaemon/netdaemon.c.tags b/src/netdaemon/netdaemon.c.tags
index dba5009..093cdc6 100644
--- a/src/netdaemon/netdaemon.c.tags
+++ b/src/netdaemon/netdaemon.c.tags
@@ -346,6 +346,8 @@ EL2HLT
 EL2NSYNCÌ65536Ö0
 EL3HLTÌ65536Ö0
 EL3RSTÌ65536Ö0
+ELEM_SWAPÌ65536Ö0
+ELEM_SWAPÌ131072Í(a,b)Ö0
 ELIBACCÌ65536Ö0
 ELIBBADÌ65536Ö0
 ELIBEXECÌ65536Ö0
@@ -836,6 +838,7 @@ IUTF8
 IXANYÌ65536Ö0
 IXOFFÌ65536Ö0
 IXONÌ65536Ö0
+ItemÌ4096Ö0Ïdouble
 LC_ADDRESSÌ65536Ö0
 LC_ADDRESS_MASKÌ65536Ö0
 LC_ALLÌ65536Ö0
@@ -1236,6 +1239,8 @@ PF_VSOCK
 PF_WANPIPEÌ65536Ö0
 PF_X25Ì65536Ö0
 PIPE_BUFÌ65536Ö0
+PIX_SORTÌ65536Ö0
+PIX_SORTÌ131072Í(a,b)Ö0
 PKEY_DISABLE_ACCESSÌ65536Ö0
 PKEY_DISABLE_WRITEÌ65536Ö0
 POLLING_TMOUTÌ65536Ö0
@@ -4540,8 +4545,8 @@ __kernel_caddr_t
 __kernel_clock_tÌ4096Ö0Ï__kernel_long_t
 __kernel_clockid_tÌ4096Ö0Ïint
 __kernel_daddr_tÌ4096Ö0Ïint
-__kernel_fd_setÌ4096Ö0Ïanon_struct_8
-__kernel_fsid_tÌ4096Ö0Ïanon_struct_9
+__kernel_fd_setÌ4096Ö0Ïanon_struct_21
+__kernel_fsid_tÌ4096Ö0Ïanon_struct_22
 __kernel_gid16_tÌ4096Ö0Ïunsigned short
 __kernel_gid32_tÌ4096Ö0Ïunsigned int
 __kernel_gid_tÌ4096Ö0Ïunsigned int
@@ -4618,6 +4623,7 @@ __sigevent_t_defined
 __siginfo_t_definedÌ65536Ö0
 __sigset_t_definedÌ65536Ö0
 __sigstack_definedÌ65536Ö0
+__sigval_tÌ4096Ö0Ïsigval
 __sigval_t_definedÌ65536Ö0
 __size_tÌ65536Ö0
 __size_t__Ì65536Ö0
@@ -4689,7 +4695,13 @@ __wsum
 __wurÌ65536Ö0
 __x86_64Ì65536Ö0
 __x86_64__Ì65536Ö0
+_attributeÌ64Îsigevent::anon_union_8::anon_struct_9Ö0Ïpthread_attr_t *
+_functionÌ1024Í(__sigval_t)Îsigevent::anon_union_8::anon_struct_9Ö0Ïvoid
+_padÌ64Îsigevent::anon_union_8Ö0Ïint
 _pthread_cleanup_bufferÌ2048Ö0
+_sigev_threadÌ64Îsigevent::anon_union_8Ö0Ïanon_struct_9
+_sigev_unÌ64ÎsigeventÖ0Ïanon_union_8
+_tidÌ64Îsigevent::anon_union_8Ö0Ï__pid_t
 abortÌ64ÎstdÖ0Ïusing
 abortÌ65536Ö0
 absÌ64ÎstdÖ0Ïusing
@@ -4718,11 +4730,13 @@ anon_enum_6
 anon_struct_0Ì2048Ö0
 anon_struct_1Ì2048Ö0
 anon_struct_10Ì2048Ö0
+anon_struct_21Ì2048Ö0
+anon_struct_22Ì2048Ö0
 anon_struct_4Ì2048Ö0
 anon_struct_5Ì2048Ö0
 anon_struct_7Ì2048Ö0
-anon_struct_8Ì2048Ö0
-anon_struct_9Ì2048Ö0
+anon_struct_9Ì2048Îsigevent::anon_union_8Ö0
+anon_union_8Ì8192ÎsigeventÖ0
 arg_doubleÌ4Îanon_enum_2Ö0
 arg_endÌ64Îprctl_mm_mapÖ0Ï__u64
 arg_floatÌ4Îanon_enum_2Ö0
@@ -4851,7 +4865,7 @@ fdim
 fdimÌ65536Ö0
 fdimfÌ65536Ö0
 fdimlÌ65536Ö0
-fds_bitsÌ64Îanon_struct_8Ö0Ïunsigned long
+fds_bitsÌ64Îanon_struct_21Ö0Ïunsigned long
 flagÌ64Îanon_struct_4Ö0Ïint *
 floorÌ64ÎstdÖ0Ïusing
 floorÌ65536Ö0
@@ -5028,6 +5042,7 @@ mbstowcs
 mbstowcsÌ65536Ö0
 mbtowcÌ64ÎstdÖ0Ïusing
 mbtowcÌ65536Ö0
+meanTÌ16384Ö0Ïdouble
 minÌ65536Ö0
 mmapbufÌ4096Ö0Ïanon_struct_1
 mode_tÌ4096Ö0Ï__mode_t
@@ -5090,6 +5105,7 @@ pow
 ppsfreqÌ64ÎtimexÖ0Ï__syscall_slong_t
 prctl_mm_mapÌ2048Ö0
 precisionÌ64ÎtimexÖ0Ï__syscall_slong_t
+process_TÌ16Í()Ö0Ïvoid
 pthread_cleanup_popÌ131072Í(execute)Ö0
 pthread_cleanup_pop_restore_npÌ131072Í(execute)Ö0
 pthread_cleanup_pushÌ131072Í(routine,arg)Ö0
@@ -5101,6 +5117,7 @@ qsort
 qsortÌ65536Ö0
 quick_exitÌ64ÎstdÖ0Ïusing
 quick_exitÌ65536Ö0
+quick_selectÌ16Í(Item *idata, int n)Ö0ÏItem
 r_WARNÌ16Í(const char *fmt, ...)Ö0Ïint
 r_pr_Ì16Í(const char *fmt, ...)Ö0Ïint
 r_pr_nottyÌ16Í(const char *fmt, ...)Ö0Ïint
@@ -5184,19 +5201,27 @@ si_uid
 si_upperÌ65536Ö0
 si_utimeÌ65536Ö0
 si_valueÌ65536Ö0
+sigev_notifyÌ64ÎsigeventÖ0Ïint
 sigev_notify_attributesÌ65536Ö0
 sigev_notify_functionÌ65536Ö0
+sigev_signoÌ64ÎsigeventÖ0Ïint
+sigev_valueÌ64ÎsigeventÖ0Ï__sigval_t
+sigeventÌ2048Ö0
 sigeventÌ32768Ö0
+sigevent_tÌ4096Ö0Ïsigevent
 sigmaskÌ131072Í(sig)Ö0
 signalsÌ16Í(int signo)Ö0Ïvoid
 signalsÌ1024Í(int sig)Ö0Ïvoid
 signbitÌ64ÎstdÖ0Ïusing
 signbitÌ65536Ö0
 signbitÌ131072Í(x)Ö0
+sigvalÌ8192Ö0
 sinÌ64ÎstdÖ0Ïusing
 sinÌ65536Ö0
 sinhÌ64ÎstdÖ0Ïusing
 sinhÌ65536Ö0
+sival_intÌ64ÎsigvalÖ0Ïint
+sival_ptrÌ64ÎsigvalÖ0Ïvoid *
 sqrtÌ64ÎstdÖ0Ïusing
 sqrtÌ65536Ö0
 srandÌ64ÎstdÖ0Ïusing
@@ -5304,8 +5329,8 @@ va_arg
 va_copyÌ131072Í(d,s)Ö0
 va_endÌ131072Í(v)Ö0
 va_startÌ131072Í(v,l)Ö0
+valÌ64Îanon_struct_22Ö0Ïint
 valÌ64Îanon_struct_4Ö0Ïint
-valÌ64Îanon_struct_9Ö0Ïint
 waittoreadÌ16Í(int sock)Ö0Ïint
 wcstombsÌ64ÎstdÖ0Ïusing
 wcstombsÌ65536Ö0
diff --git a/src/netdaemon/netdaemon.geany b/src/netdaemon/netdaemon.geany
index d5f80fe..0537420 100644
--- a/src/netdaemon/netdaemon.geany
+++ b/src/netdaemon/netdaemon.geany
@@ -20,13 +20,24 @@ indent_mode=3
 [project]
 name=netdaemon
 base_path=/home/eddy/Docs/SAO/BTA/MIRROR_CONTROL_termo/Project/netdaemon
+description=
 
 [long line marker]
 long_line_behaviour=1
 long_line_column=100
 
 [files]
-current_page=-1
+current_page=3
+FILE_NAME_0=0;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fcmdlnopts.c;0;4
+FILE_NAME_1=0;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fcmdlnopts.h;0;4
+FILE_NAME_2=0;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fmain.c;0;4
+FILE_NAME_3=9982;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fsocket.c;0;4
+FILE_NAME_4=0;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fsocket.h;0;4
+FILE_NAME_5=4650;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fterm.c;0;4
+FILE_NAME_6=0;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fterm.h;0;4
+FILE_NAME_7=3250;C;0;EKOI8-R;0;1;0;%2Fhome%2Feddy%2FDocs%2FSAO%2FBTA%2FMIRROR_CONTROL_termo%2FProject%2Fnetdaemon%2Fdatapoints.xy;0;4
+FILE_NAME_8=7594;C;0;EUTF-8;0;1;0;%2Fhome%2Feddy%2FDropbox%2FProjects%2Ffits_filter%2Fmedian.c;0;4
+FILE_NAME_9=0;C;0;EUTF-8;0;1;0;%2Fhome%2Feddy%2FDropbox%2FProjects%2Ffits_filter%2Fmedian.h;0;4
 
 [VTE]
 last_dir=/home/eddy
diff --git a/src/netdaemon/socket.c b/src/netdaemon/socket.c
index 5033f03..c65c872 100644
--- a/src/netdaemon/socket.c
+++ b/src/netdaemon/socket.c
@@ -39,6 +39,8 @@
 
 // temperatures: T0, T1, N2
 static char strT[3][BUFLEN];
+// mean temperature
+static double meanT;
 
 /**************** COMMON FUNCTIONS ****************/
 /**
@@ -171,8 +173,13 @@ static void *handle_socket(void *asock){
                 putlog("can't send data, some error occured");
             }
             pthread_mutex_unlock(&mutex);
-            break;
-        }else break; // here can be more parsers
+        }else if(strncmp("Tmean", found, 5) == 0){ // send user meanT
+            char tbuf[10];
+            ssize_t L = snprintf(tbuf, 10, "%.2f", meanT);
+            if(L != write(sock, tbuf, L)) WARN("write()");
+            //DBG("Ask Tmean = %g", meanT);
+        } // here can be more parsers
+        break;
     }
     close(sock);
     //DBG("closed");
@@ -219,7 +226,98 @@ static void *server(void *asock){
     putlog("server(): UNREACHABLE CODE REACHED!");
 }
 
-// data gathering & socket parsing
+typedef double Item;
+#define ELEM_SWAP(a, b) {register Item t = a; a = b; b = t;}
+#define PIX_SORT(a, b)  {if (a > b) ELEM_SWAP(a, b);}
+/**
+ * quick select - algo for approximate median calculation for array idata of size n
+ */
+Item quick_select(Item *idata, int n){
+    int low, high;
+    int median;
+    int middle, ll, hh;
+    Item *arr = MALLOC(Item, n);
+    memcpy(arr, idata, n*sizeof(Item));
+    low = 0 ; high = n-1 ; median = (low + high) / 2;
+    for(;;){
+        if(high <= low) // One element only
+            break;
+        if(high == low + 1){ // Two elements only
+            PIX_SORT(arr[low], arr[high]) ;
+            break;
+        }
+        // Find median of low, middle and high items; swap into position low
+        middle = (low + high) / 2;
+        PIX_SORT(arr[middle], arr[high]) ;
+        PIX_SORT(arr[low], arr[high]) ;
+        PIX_SORT(arr[middle], arr[low]) ;
+        // Swap low item (now in position middle) into position (low+1)
+        ELEM_SWAP(arr[middle], arr[low+1]) ;
+        // Nibble from each end towards middle, swapping items when stuck
+        ll = low + 1;
+        hh = high;
+        for(;;){
+            do ll++; while (arr[low] > arr[ll]);
+            do hh--; while (arr[hh] > arr[low]);
+            if(hh < ll) break;
+            ELEM_SWAP(arr[ll], arr[hh]) ;
+        }
+        // Swap middle item (in position low) back into correct position
+        ELEM_SWAP(arr[low], arr[hh]) ;
+        // Re-set active partition
+        if (hh <= median) low = ll;
+        if (hh >= median) high = hh - 1;
+    }
+    Item ret = arr[median];
+    FREE(arr);
+    return ret;
+}
+#undef PIX_SORT
+#undef ELEM_SWAP
+
+static void process_T(){
+    int i, Num = 0;
+    time_t tmeasmax = 0;
+    double arr[128];
+    // get statistics
+    poll_sensors(0); // poll N2
+    // scan over controllers on mirror & calculate median
+    for(i = 1; i < 8; ++i){
+        if(poll_sensors(i)){
+            int N, p;
+            for(p = 0; p < 2; ++p) for(N = 0; N < 8; ++ N){
+                double T = t_last[p][N][i];
+                time_t t = tmeasured[p][N][i];
+                if(T > -100. && T < 100.){
+                    arr[Num++] = T;
+                    if(t > tmeasmax) tmeasmax = t;
+                }
+            }
+        }
+    }
+    // calculate mean
+    double Tmed = quick_select(arr, Num);
+    double Tbot = Tmed - 3., Ttop = Tmed + 3.;
+    DBG("Got %d values, Tmed=%g", Num, Tmed);
+    // throw out all more than +-3degrC and calculate meanT
+    Num = 0;
+    double Tsum = 0.;
+    for(i = 1; i < 8; ++i){
+        int N, p;
+        for(p = 0; p < 2; ++p) for(N = 0; N < 8; ++ N){
+            double T = t_last[p][N][i];
+            if(T > Ttop || T < Tbot || tmeasmax - tmeasured[p][N][i] > 1800){
+                t_last[p][N][i] = -300.;
+            }else{
+                ++Num; Tsum += T;
+            }
+        }
+    }
+    meanT = Tsum / Num;
+    DBG("got %d, mean: %g\n\n", Num, meanT);
+}
+
+// data gathering & socket management
 static void daemon_(int sock){
     if(sock < 0) return;
     pthread_t sock_thread;
@@ -245,34 +343,33 @@ static void daemon_(int sock){
         char bufs[3][BUFLEN]; // temporary buffers
         char *ptrs[3] = {bufs[0], bufs[1], bufs[2]};
         size_t lens[3] = {BUFLEN, BUFLEN, BUFLEN}; // free space
+        process_T(); // get new temperatures & throw out bad results
         for(i = 0; i < 8; ++i){ // scan over controllers
-            if(poll_sensors(i)){
-                int N, p;
-                for(p = 0; p < 2; ++p) for(N = 0; N < 8; ++ N){
-                    double T = t_last[p][N][i];
-                    char **buf;
-                    size_t *len;
-                    //DBG("T%d [%d][%d] = %g",i, p,N,T);
-                    if(T > -100. && T < 100.){ // fill buffer
-                        size_t l;
-                        if(i == 0){
-                            buf = &ptrs[2]; len = &lens[2];
-                            // Nsens Npair T time
-                            l = snprintf(*buf, *len, "%d\t%d\t%.2f\t%ld\n", N, p, T,
-                                            tmeasured[p][N][i]);
-                        }else{
-                            buf = &ptrs[p]; len = &lens[p];
-                            // x y T time
-                            l = snprintf(*buf, *len, "%d\t%d\t%.2f\t%ld\n", SensCoords[N][i][0],
-                                            SensCoords[N][i][1], T, tmeasured[p][N][i]);
-                        }
-                        *len -= l;
-                        *buf += l;
+            int N, p;
+            for(p = 0; p < 2; ++p) for(N = 0; N < 8; ++ N){
+                double T = t_last[p][N][i];
+                char **buf;
+                size_t *len;
+                //DBG("T%d [%d][%d] = %g",i, p,N,T);
+                if(T > -100. && T < 100.){ // fill buffer
+                    size_t l;
+                    if(i == 0){
+                        buf = &ptrs[2]; len = &lens[2];
+                        // Nsens Npair T time
+                        l = snprintf(*buf, *len, "%d\t%d\t%.2f\t%ld\n", N, p, T,
+                                        tmeasured[p][N][i]);
+                    }else{
+                        buf = &ptrs[p]; len = &lens[p];
+                        // x y T time
+                        l = snprintf(*buf, *len, "%d\t%d\t%.2f\t%ld\n", SensCoords[N][i][0],
+                                        SensCoords[N][i][1], T, tmeasured[p][N][i]);
                     }
+                    *len -= l;
+                    *buf += l;
                 }
             }
         }
-        DBG("BUF0:\n%s\nBUF1:\n%s\nBUF2:\n%s", bufs[0],bufs[1],bufs[2]);
+        //DBG("BUF0:\n%s\nBUF1:\n%s\nBUF2:\n%s", bufs[0],bufs[1],bufs[2]);
         tgot = dtime();
         // copy temporary buffers to main
         pthread_mutex_lock(&mutex);
diff --git a/src/netdaemon/term.c b/src/netdaemon/term.c
index 3591b1c..9be7c34 100644
--- a/src/netdaemon/term.c
+++ b/src/netdaemon/term.c
@@ -159,6 +159,8 @@ static int send_cmd(int N, char cmd){
     if(N < 0 || N > 7) return 1;
     char buf[4] = {(char)N + '0', cmd, '\n', 0};
     char *rtn;
+    // clear all incomint data
+    while(read_string());
     //DBG("send cmd %s", buf);
     if(write_tty(buf, 3)) return 1;
     if((rtn = read_string())){