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

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.

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)

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

reduced to an area of about 100 km

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

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 ;

idx +=4 ;

idx +=2 ;

idx +=1 ;

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

 2 MSB and 6 LSB
idx=1 after the 2 

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.