traci-python(getNeighbors)

[shuowang572875852]

Hello,
Sorry to bother you,I want to add some new functions to traci4matlab in the same way as traci-python: such as getNeighbors(vehID, mode).
1、I add VAR_NEIGHBORS = '0xbf' to constants.m
2、add traci.constants.VAR_NEIGHBORS,... and {'traci.vehicle.readNeighbors'} to RETURN_VALUE_FUNC.m
3、write readNeighbors.m
function [vehID, dist] = readNeighbors(result)
%读取周围车辆相关信息
N=result.readInt();
neighs = [];
for i =1:N
vehID = result.readString();
dist = result.readDouble();
neighs.append(vehID,dist);
end

 4、write getNeighbors.m

function [vehicleID, dist] = getNeighbors(vehID, mode)
import traci.constants
global message
traci.beginMessage(constants.CMD_GET_VEHICLE_VARIABLE,constants.VAR_NEIGHBORS,...
vehID, 2);
message.string = [message.string uint8(sscanf(constants.TYPE_UBYTE,'%x'))...
uint8(mode)];
[vehicleID, dist] = traci.vehicle.readNeighbors(traci.checkResult(...
constants.CMD_GET_VEHICLE_VARIABLE, constants.VAR_NEIGHBORS, vehID));

But when i run getNeighbors.m , the matlab commandline get follow errors:
error use traci.sendExact (line 46)
64 164 255 Error Get Vehicle Variable: unsupported variable 0xbf specified
The sumo-gui error:
Error: Answered with error to command 0xa4: Get Vehicle Variable: unsupported variable 0xbf specified

So how can i do for it ?Can you give me some help?Looking forward to your reply.