Decodeur_Trame_LoRA

These decoders are designed to process frames arriving on the TTN network. they must be placed in "payload Formats->decoder" of the TTN application

it is intended for frames containing the information:

• longitude
• latitude
• detection value
• battery level value

Version

Decodeur_full

it is the most classic version of each information and precede it with its identifier and the order does not matter nor the presence or not of all the information. This is the most flexible version.

Decodeur_10(To be used for the application Supagrohydaulic)

version without identifiers. the order must therefore be respected imperatively. it accepts 2 types of messages: -heartbeat (only alert and battery) -full message (longitude and latitude in addition)

decodeur_7

planned for soon decoder reducing the geographical area of GPS coordinates. merging of detection and battery value

decodeur_5

reduced to an area of about 100 km

fonction read

several functions are declared for reading data of different size and type

readInt64BE and readUInt64BE

these 2 functions read 8 bytes the idx will have to advance by 8 after using them It's big edian coding. So we start with the most significant bytes. idx +=8 ;

readInt32BE and readUInt32BE

idx +=4 ;

readInt16BE and readInt16BE

idx +=2 ;

readInt8 and readInt8

idx +=1 ;

readUInt4H and readUInt4L

it is 2 function is used in a row without advancing the idx. the first reads the 4 most significant bits, the second the least significant 4 bits. idx=1 after the 2

readUInt2H and readUInt2L

 2 MSB and 6 LSB
idx=1 after the 2 

readbool

idx=1
return a Boolean 

it is possible to build from these functions all the formats you want to send float. multiply the data by the correct power of 10 to obtain an integer. Then we just have to divide during decoding.