Add support for Q-walk_by to Wireless-MBus

Author: zuckschwerdt

src/devices/m_bus.c

@@ -155,6 +155,10 @@ typedef struct {
     uint8_t     l_npci;
     uint8_t     tpci;
     uint8_t     apci;
+    /* Q-walk_by */
+    uint32_t    q_total;
+    uint32_t    q_lastyear;
+    uint32_t    q_lastmonth;
 } m_bus_block2_t;
 
 // Data structure for block 1
@@ -760,6 +764,36 @@ static int parse_block2(const m_bus_data_t *in, m_bus_block1_t *block1)
             b2->CW = b[4]<<8 | b[3];
             b2->pl_offset = BLOCK1A_SIZE-2 + 5;
         }
+
+        /* Q-walk_by */
+        /* based on leaked infos */
+        /* 000: CI:120 */
+        /* 000: 0x780dff5f Magic for QUNDIS walk_by */
+        /* 004: 0x35 L:53 Length of walk_by field (under investigation) */
+        /* 005: 0x00 ST:0 Status 0= No Error */
+        /* 006: 0x82 unknown */
+        /* 007: AC AccessNumber  */
+        /* 008: 0x0000 CW:0 no encryption */
+        /* 018: 0x00000000 V:total BCD LSB first  */
+        /* 024: 0x00000000 V:lastyear */
+        /* 036: 0x00000000 V:lastmonth */
+        /* timestamps following */
+        u_int32_t ci_magic = ((uint32_t)b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
+        if (ci_magic == 0x780dff5f) {
+            b2->AC          = b[7];
+            b2->ST          = b[5];
+            b2->CW          = (b[9] << 8) | (b[8]);
+            b2->pl_offset   = BLOCK1A_SIZE - 2 + 8;
+            b2->q_total     = ((uint32_t)b[20] << 24) | (b[19] << 16) | (b[18] << 8) | (b[17]);
+            b2->q_lastyear  = ((uint32_t)b[26] << 24) | (b[25] << 16) | (b[24] << 8) | (b[23]);
+            b2->q_lastmonth = ((uint32_t)b[38] << 24) | (b[37] << 16) | (b[36] << 8) | (b[35]);
+            if (block1->A_DevType == 6) {
+                /* WarmWater */
+            }
+            if (block1->A_DevType == 8) {
+                // snprintf(extra, sizeof(extra), "%02x%02x%02x%02x%02x", b[6], b[7], b[8], b[9], b[10]);
+            }
+        }
     //    fprintf(stderr, "Instantaneous Value: %02x%02x : %f\n",b[9],b[10],((b[10]<<8)|b[9])*0.01);
     }
     return 0;
@@ -900,6 +934,9 @@ static int m_bus_output_data(r_device *decoder, bitbuffer_t *bitbuffer, const m_
 //                "L",        "Length",       DATA_INT,       block1->L,
                 "data_length",  "Data Length",          DATA_INT,           out->length,
                 "data",     "Data",         DATA_STRING,    str_buf,
+                "Q_total",      "Q_total",      DATA_COND,  block1->block2.CI == 0x78,  DATA_FORMAT,    "%d m3",    DATA_INT,   block1->block2.q_total,
+                "Q_lastyear",   "Q_lastyear",   DATA_COND,  block1->block2.CI == 0x78,  DATA_FORMAT,    "%d m3",    DATA_INT,   block1->block2.q_lastyear,
+                "Q_lastmonth",  "Q_lastmonth",  DATA_COND,  block1->block2.CI == 0x78,  DATA_FORMAT,    "%d m3",    DATA_INT,   block1->block2.q_lastmonth,
                 "mic",      "Integrity",    DATA_STRING,    "CRC",
                 NULL);
         /* clang-format on */