HWHardsoft
commented
1 year ago Addendum:
When I try to decode the data from a commercial M-BUS device (whose payload is not encoded with MBUSPayload), things look even worse. I tried to decode the data of an elvaco MBUS thermostat. No problem with LorusFree. MBusPaypal does not find any data fields and reports 4 errors:
Data from Thermostat (payload starts at address 19):
68 53 53 68 8 2 72 11 82 0 24 96 15 16 0 20 0 0 0 1 fd 1b 0 2 fc 3 48 52 25 74 62 17 22 fc 3 48 52 25 74 5c 17 12 fc 3 48 52 25 74 68 17 2 65 a2 8 22 65 9e 8 12 65 a2 8 1 72 0 72 65 0 0 b2 1 65 0 0 c 78 11 82 0 24 3 fd f 5 9 3 1f 9f 16
And here the decoding by LorusFree:
Zeppelin500
Hi,
First of all, thank you for this great library.
Based on your library, I wrote a demo program for a small consumption meter (MBUS slave) for the ESP32. That works fine too. For tests I used LorusFree and LibMBUS (on the Raspberry Pi). I can read my meter correctly with both programs.
I am currently trying to write a similar program for a master that decodes the data on the ESP32 with your library. Unfortunately, there seems to be a couple of problems. MBUSPayload recognizes the 7 data fields of the meter, but only displays 5 as JSON code??
`
define DEBUG true
include "MBUSPayload.h"
include "ArduinoJson.h"
// Serial interface used for mbus to allow use of 8E1 encoding
include
HardwareSerial *customSerial;
define MBUS_BAUD_RATE 2400
define MBUS_ADDRESS 2
define MBUS_TIMEOUT 1000 // milliseconds
define MBUS_DATA_SIZE 255
define MBUS_GOOD_FRAME true
define MBUS_BAD_FRAME false
unsigned long loop_start = 0; unsigned long last_loop = 0; bool firstrun = true; int Startadd = 0x13; // Start address for decoding
void setup() { Serial.begin(115200); Serial.println(F("emonMbus startup")); Serial.println(F("mbus:")); Serial.print(F(" slave address: ")); Serial.println(MBUS_ADDRESS); Serial.print(F(" baud rate: ")); Serial.println(MBUS_BAUD_RATE); customSerial = &Serial1; customSerial->begin(MBUS_BAUD_RATE, SERIAL_8E1); // mbus uses 8E1 encoding delay(1000); // let the serial initialize, or we get a bad first frame }
void loop() { loop_start = millis();
/****
DATA COLLECTION LOOP * ****/ if ((loop_start-last_loop)>=9800 || firstrun) { // 9800 = ~10 seconds last_loop = loop_start; firstrun = false;
/*****
if (DEBUG) Serial.print(F("mbus: requesting data from address: ")); if (DEBUG) Serial.println(MBUS_ADDRESS); mbus_request_data(MBUS_ADDRESS); mbus_good_frame = mbus_get_response(mbus_data, sizeof(mbus_data)); if (mbus_good_frame) { if (DEBUG) Serial.println(F("mbus: good frame: ")); if (DEBUG) print_bytes(mbus_data, sizeof(mbus_data));
int packet_size = mbus_data[1] + 6; Serial.println(F("Creating payload buffer...")); MBUSPayload payload(255); Serial.print(F("Packet size: ")); Serial.println(packet_size);
Serial.print(F("Start Address: ")); Serial.println(Startadd);
Serial.println(F("Decoding...")); DynamicJsonDocument jsonBuffer(512); JsonArray root = jsonBuffer.createNestedArray();
uint8_t fields = payload.decode(&mbus_data[Startadd], packet_size - Startadd - 2, root); serializeJsonPretty(root, Serial);
Serial.println(); Serial.print("Detected data fields: "); Serial.println(fields);
Serial.print("Detected errors: "); Serial.println(payload.getError());
Serial.println(); for (uint8_t i=0; i<fields; i++) { float value = root[i]["value_scaled"].as();
uint8_t code = root[i]["code"].as();
Serial.print("Field "); Serial.print(i+1);
Serial.print(" ("); Serial.print((char ) payload.getCodeName(code));
Serial.print("): ");
Serial.print(value); Serial.print(" "); Serial.print((char ) payload.getCodeUnits(code));
Serial.println();
}
Serial.println(); } else { Serial.print(F("mbus: bad frame: ")); print_bytes(mbus_data, sizeof(mbus_data)); } } } `
So the binary inputs and outputs are not decoded correctly.