I am trying to pass a C++ struct from my arduino to my raspberry pi. I have a struct that looks like this:
struct node_status
{
char *node_type = "incubator";
char *sub_type; // set the type of incubator
int sub_type_id;
bool sleep = false; // set to sleep
int check_in_time = 1000; // set check in time
bool LOCK = false; // set if admin control is true/false
} nodeStatus;
I tried using the python module named struct
from struct import *
print("Rcvd Node Status msg from 0{:o}".format(header.from_node))
print("node_type: {}".format(unpack("10s",payload[0]))) #node_type
node_type = unpack("10s",payload[0])
print("sub_type: {}".format(unpack("10s",payload[1]), header.from_node)) #sub_type
sub_type = unpack("10s",payload[1])
print("sub_type_id: {}".format(unpack("b",payload[2])))
sub_type_id = unpack("b",payload[2])
print("sleep: {}".format(unpack("?",payload)[3])) #sleep
sleep = unpack("?",payload[3])
print("check_in_time: {}".format(unpack("l",payload[4]))) #check_in_time
check_in_time = unpack("l",payload[4])
print("Lock: {}".format(unpack("?",payload[5]))) #LOCK
Lock = unpack("?",payload[5])
but I am not having much luck. I was even looking at just using ctypes module but seem to not be going anywhere..
from ctypes import *
class interpret_nodes_status(Structure):
_fields_ = [('node_type',c_char_p),
('sub_type',c_char_p),
('sub_type_id',c_int),
('sleep',c_bool),
(check_in_time',c_int),
('LOCK',c_bool)]
nodestatus = translate_nodes_status(payload)
but that just gives me an error
TypeError: bytes or integer address expected instead of bytearray instance
What can I do? WHERE am I going wrong with this?
EDIT:
I am using the RF24Mesh Library from
https://github.com/nRF24/RF24Mesh
The way I send the message is this?
RF24NetworkHeader header();
if (!mesh.write(&nodeStatus, /*type*/ 126, sizeof(nodeStatus), /*to node*/ 000))
{ // Send the data
if ( !mesh.checkConnection() )
{
Serial.println("Renewing Address");
mesh.renewAddress();
}
}
else
{
Serial.println("node status msg Sent");
return;
}
}
from C++ byte array (struct) interpreted by Python
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